I'm new here, please write to me if the topic of a given [item is finished (sold) or is the topic closed somehow?

If a trade is done simply stop replying to the topic and if you still can edit your original first post to let others know its finished.:)
You can't close topics on your own and moderators will only close them if there is a violation of forum rules.

THX.

Hello

Just to add to Post #2, since you are new. Please check out these links to help you familiarize yourself with the forums.

d2jsp New User Guide

How to Trade on d2jsp

Site Rules

Trading Rules

How To Request A Mediator And Prevent Scams

also on the original post you'll be able to edit, use the emote that's and put complete.