If its not giving you the option to re-do I don't think you can.

I remember the very first time I logged into 2.0 release when I couldn't connect to the server I had the option to re-make my character upon attempting to log-in again.
This happened about 4 times until I finally got on.
So it may still be possible if you've not actually connected yet. But the option should be there.

Don't delete your character. They is no way to load your character, you can only load the appearance if you have that saved from beta/open/benchmark.