Using college board to pay for college admissions fee?

Hello!
I used common app fee waivers to pay for 8 of my colleges and the rest I had to pay with my card but the site wouldn’t let me. It said that I requested for fee waivers for all colleges but that’s not the case so i have a few colleges that still need to be paid.
I called one of the colleges , the university of Rochester, and the admissions office told me to pay on college board, but I didn’t know that was possible. When I went to try it I couldn’t find anything so I was wondering if anyone knew how to do it?
Thank you!

I think you should call back and ask the admissions office to help walk you through the process.