Payment Request - how to edit Supplier

Summary

AR refund created Payment Request; how do we edit that Supplier name and address?

Content

We had an AR receipt to refund, and created a Payment Request which shows up on the Payables Aging.

How do we edit that Supplier name and address?  It created the Payment Request based on one of the related customers, not the one we want to repay.

We can't locate the Supplier name found on the Payables Aging.

Thanks,

Beth