You can view and modfiy many attributes of your account in the your account section:
If you can't login, make sure that you are entering your password exactly as you created it and your username in all lowercase. If you continue to have problems then reset your password. If your e-mail has changed and you continue to have problem logging in, then contact support.
If you've inadvertently deleted your account and had purchased services, you will need to e-mail the billing department, and give them your username and information from the e-mail confirmation of your purchase(s). If you did not have any purchased services, you can simply recreate your account.
If you've lost or never received the account confirmation e-mail you can still confirm your account without waiting 48 hours. Use the password reset tool and enter your username to request a password reset transaction. Follow the directions in the e-mail to reset your password and your account will be confirmed.