I. HOW TO FIND THE RELEVANT PAGE
Log in. Near your picture and name in the top, right-hand corner, click on the Down arrow to open up the dropdown menu. Click on Your Subscription (brown box below).
The Your subscription page will open.
II. HOW TO UPDATE YOUR BILLING DETAILS
Step 1: Click on Update billing details (brown box in image above).
Step 2: The Update Billing details page will open. Complete the details. Agree to the Terms and Conditions (brown box in image below), and click the blue Update button at the bottom of the page.