I tried three times to upgrade via credit card and I get an error page.

Hello Kristelle,
Thank you for the report. I added some temporary credit for you. In a few days, if you don't mind, please try again. By that time, the issue will have been resolved.
Thank you for taking the time to write in. Please let me know you need help with anything else.

Thank you.

Turns out you were subscribing already, but it didn't extend for a year. I took care of it, so you are good until the automatic payment next March.