Tag all posts as either "open: free" or "open: trade" depending on if you want something in return. When you no longer have any usernames available, tag your post "closed".
This community is not for selling usernames. There are other communities for that. Anyone selling usernames will be banned.
However, you may trade for services, such as coding or graphics.
Do not post requests for specific usernames. It's annoying.
Your post must include: The name or names you are offering up, whether they are for free giveaway or for trade, and how best to get ahold of you. You need to tag your post as either "open: free" or "open: trade" depending on what you are offering. If you are offering more than one option (ie, willing to trade ~x, ~y, and ~z, willing to give away ~a, ~b, and ~c), then it is fine to use both tags in one post.