Important: you won't be able to change your username once you've chosen it or if you sign in via Social Network.
To register an account on www.Ultimate-Guitar.com:
Click the Sign up link at the top left corner of any page.
Choose the option to create an account.
If you choose the "Sign up with email" option, enter your Username, Email, Password, and Captcha in the respective fields and click the "Sign up" button.
Check your email for verification of your account and a welcome message from Ultimate Guitar.