Avoid this service if you can. Once you have registered, there is no way to change your address or phone number. There is no help section, and the only info you can change is your email address or if you receive paper or email bills. AVOID. Just mail the check. It's a pain, but this website seems sketchy. I did not pay my bill through this service. I wanted to see if I had more than one invoice that needed to be paid. I am still not clear about that. I can't update my address or phone number. Better make sure you don't make a mistake, move, or change your number because there is apparently no way to update this info.