Some of the users on these forums are pretty forum-savvy--they've used forums for other subjects even if they're new to Ubuntu, so they know how to ask questions, how to find their old threads, etc.
Well, other users ask us from time to time how to do the forum basics (How do I post a new thread? How do I find my old threads?), and it occurred to me that we don't really have tutorials for those things on our site, and maybe we should. So here they are: one tutorial per post.
Please feel free to add your own tutorials to this thread, if you think they'd be helpful to new users--only tutorials on how to use the forums, not on how to use Ubuntu.