Once you've chosen that job, too bad. You can't change. If you're desperate I guess you can ask the inferno (they're the names in green and TM, look under "Forum Leaders" at the bottom of the page) to change, though I doubt they'll do it. Dunno though, but I do know you're not allowed to change.
As for the second question, you mean a second account? As for that I guess you could head to TM and ask him to delete it for you. <_< Seeing as how second accounts aren't allowed..