Welcome to the Xfinity Forum, @Keyna1! We appreciate you for posting to get assistance with paying your bill online. I'm sorry for the inconvenience you're having and wanted to provide the steps to walk you through getting this taken care of. Please be sure to log in with your primary Comcast email address and password. You can find more information about how to make a one-time payment or set up a payment arrangement here.
Check out these other self-help options that may be beneficial:
I hope this helps!