You can't delete your account until you give everything your glitch owns away. The best time to do that is around 8:30pm, Pacific time. Don't forget to announce it in global chat.
One thing to be aware of is that T.S. seems to key an account based on an email address. If you delete an account associated with an email address, that address is essentially banned from getting a new glitch account. If you try, it will tell you there is already an account with that address, and if you try to log in with that account it says you're deleted.
I guess that email address is considered to be tainted with apostasy or something.
So if you want to start over from scratch, be prepared to get a new gmail or yahoo address to sign up with.