Hi @Maryeaker!
Welcome to the AT&T Community Forums! Thank you for reaching out to me, I will be glad to help!
Can you login into the myAT&T website? What error message are you getting? Are you trying to setup AutoPay?
Once you login to the website, you should be able to make a payment online. You do not have register to make a payment. You do have to register for a myAT&T account in order to be able to access the site though.
Get tips to resolve the most common login issues. Also, learn how to log in to manage accounts from a smartphone, tablet, or computer. To learn more, please click here.
Learn about the convenient options to pay your wireless bill – with your online account, over the phone, in person, or by mail. Please click here.
Hope this helps!
Kevin, AT&T Community Specialist