Modifying User Settings
Once you have created a Warlock, you can modify everything but the name and the scores. You can get to the Update Page from your Status page. Clearly you can't modify your information if you are not logged in.
If you can't log in because you have forgotten your password, do the login procedure without a password, and you will be given the option of having your password emailed to you, at the address you gave when you created your Warlock.
If you didn't give an email address, follow the same procedure, you will instead be given the opportunity to email the Administrator to ask for your password.
Next: Challenges - How to Start a Battle