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New post is at the top right of the hub. Tick items, and Trade Post writes the post. The listing is a real Reddit post under your own account. It is yours, anyone can report it the way they report any post, and you delete it the way you delete any post.

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The sequence

1

Tick the items

Only items marked available can be listed. Anything traded, or already in an open trade, is left out. You can add photos to an item without leaving the screen.
2

Press Continue

It carries the count, so it reads Continue with 3 items. If something is blocking the listing the button says that instead.
3

Fill in the details

Everything the items cannot supply: your region, an optional note about the post, and what you are looking for. Your post title is at the top of the screen and rewrites itself as you type.
4

Press Post to r/yoursubreddit

The one button in the flow that posts, and it says so.
5

Give Reddit permission

Reddit asks whether Trade Post may post as you. It asks here, immediately before the post goes up, rather than before you start typing. Refusing ends the publish and nothing is posted. Nothing you typed is lost either, so you can press the button again.
Leaving the composer discards your ticks. Going back from the details step does not: your ticks and everything you typed are both still there. Add a missing item from inside the composer rather than going back to the Inventory tab. Above the items is a link to your subreddit’s own rules. Photo counts, the title format and what may be listed at all are set per subreddit, so that page is the one that says what will actually be accepted here.

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The details step

Your post title sits at the top and rewrites itself on every keystroke. It is the same title the post will carry. You cannot edit it there; you edit the two fields under it. The two fields that reach the title come first, directly under it. The two that are body only follow. Region checks itself as you type. If what you entered does not match your subreddit’s format, the message under the box says which shapes it accepts, and the Post button says the same thing until you fix it. Nothing you typed is cleared. Wants (title) is a checklist where your subreddit closed the list, and a comma-separated box where it did not. The box opens holding the want your title would carry anyway, so you are editing a real default rather than filling in a blank. Clear it and the title uses the same word again. See Wants. Listing note is where shipping and payment terms go, along with whether you will break the lot up and anything else about the post as a whole. Up to 1,000 characters, counted under the box. It is not saved between posts, so you type it each time. Wants (body) is prefilled from your saved want list. Editing it here changes this post only. Your saved list stays as it is.

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The title

Trade Post generates it. With a region of US-NY and the usual defaults:
One item names its condition and price. Several are listed until the title runs out of room, then counted. The [W] half reads Offers when your subreddit suggests nothing and you leave the box as it opened, and a priced single item drops that word rather than printing a price and a shrug. Reddit caps a title at 300 characters. Wants are shortened first, then items fall back to +N more. Nothing is lost. The post body carries both lists in full whatever the title had room for. Your subreddit’s listing format sets the tags and the options.

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What stops a publish

The composer refuses before the post exists, so a listing that breaks your subreddit’s rules never reaches the queue. The button says which rule. On the details step the line under the Post button does the same job. A missing or malformed region, a note over its character cap, or a want list over its limit each name themselves there, and the button stays off until it is fixed. Everything you typed stays where it is. The same line covers your items. If something changes them while you are typing, say an offer you accept in another tab, the button turns off and says which rule it now breaks. Go back to the items, fix it, and come forward again. Your typing is still there.

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Editing and taking down a listing

There is no edit or close button here. Edit the body or delete the post on Reddit the way you would any other. Your listing note is fixed once the post is up. Trade Post has no way to change it, so correcting it means editing the post body on Reddit, with the warning below in mind.
Editing an item’s name, description or photos in Trade Post rewrites the body of every live listing advertising it. Hand-edits you made to that body on Reddit are replaced. Change the item, or change the body, but expect the item to win.
Deleting the post erases its Trade Post record, its offers and its trades. The post is what everything else hangs on. Delete it only when you are done with the negotiations under it.
Marking an item traded is the other way. It shows as traded on every post advertising it, without touching any of them.

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Notes

  • An item can sit on several live posts at once. See Inventory.
  • A listing keeps its own copy of the items it advertises, so it still renders if you later delete one.
  • Every photo on the listing is sent to Reddit with the post. The body names the first forty and then says how many more there are; the post itself shows them all.