We do not change usernames or delete accounts. Don't ask. Before you pick your username be certain that it is the one you want because it is yours for life. The only time in which name changes are granted is if they are purchased in our annual Solid Saints charity auction and the auction prices are often high.
The basics of the forum were explained to you here: https://forums.penny-arcade.com/discussion/244828
It's worth noting that you have 2 threads and 1 post, all requesting to delete stuff. Is there like something in private messages you want to have deleted?
That said, this is covered in the rules: