You can add a Visa, MasterCard, or other cards to your account in two ways:

1- From the app store of your device:
- Click on the menu icon (the 3 lines on the left of the screen) then "payment methods."
- Click "Add Payment Method"
- Choose the payment method you want to add, then follow the instructions.
- Click on (Payment Methods)
- Choose to add a credit or debit card.
- Enter the card number, and other information pops up to you.

2- From your device settings, which varies from one device to another according to the device's OS.