1. Click on the Person icon on the top right of reciProfity
2. Click on the Billing Portal link.
Wait for the link to the Billing Portal, it will be sent to your email.
Once in the Billing Portal you can update or add your credit card info by clicking the link next to Billing Details.
2. You will see the screen to add your credit card info.
(remember to click Save at the bottom when you are done!)