Please follow the steps below to add a payment method on Office Depot.
Open the website on your desktop computer or laptop, then click Login.
Now, log in with your email address and password.
Once you're logged in, you will see several options at the top-right side of the screen. Click on the option that says Account.
On the page, scroll down a little. Then, you will see an option for Payment Information. Click on Edit Payment Options.
Then, on the payment screen, you will see a button that says Add Credit Card. Click on Add Credit Card.
Now, enter your card credentials such as the name on card, card number, expiration date, and billing address. You could also add a nickname but it is just optional.
Then if you wish to use your billing address, click on the tick box beside Use My Billing Address.
After that, click on Save Card.
And now, your card has been added.
That's how you add a payment method on Office Depot.