Step 1: Click on the "person icon" at the top right corner of the screen.

 

 

Step 2: Select "My Account".

 

Step 3: Select the tab "Wallet".

 

Step 4: Use the blue links on the right to "+Add Bank Account" or "Add Credit Card".

 

Step 5: Click the three dots under "Actions" to remove an existing bank account or credit card.