How to Add Credit Card details to your account

1. Please go to Settings by clicking on your name.

2. Go to Your Account
3. On the right side of the page, you'll see Credit Card details that you've used to set up your account. Please go ahead and set up your Credit Card details. 
Don't worry, you won't be charged for anything when you set that up. 
4. Don't forget to click on Save Changes on the lower left of the page.