How-To:
Click on Settings
Go to the billings tab
Click on "Card Number" and input your payment information, Click outside of the card input box so it registers as filled.
Click "Add Card"
A pop up will appear while your card information is being saved, it will close out as soon as your card is saved or you can exit out, be sure to not exit the screen before you see your card appear under payment sources.
Under Payment Sources make sure you have the correct card set as your default.
Frequently Asked Questions:
If you do not see the billings or subscription tab under settings you are not logged into the "owner" Curate account.
Select "Add Card" after the payment information is entered.
After entering the card information clicking away from the text box will allow that information to register as filled allowing you to click the "add card" button.
Video Tutorial: