How do I update my credit card info for renewal?

Login to the members site, and click on your profile icon in the top right to go to your account page. The profile icon in the site navigation is where your account page can be found. 

Once inside your account page, click on "Subscriptions" where you will see and "Update" link on the right.

Once you click on that link, you will be taken to another page where you can enter and submit your new credit card details.