Twilightblue28A

I read in a different section that memberships are automatically renewed. How do I know when my membership is scheduled for renewal?
Also, if my credit card expiration date has changed as well as the three (3) digit number on the back of the credit card, how do I update the new information? Kindly provide specific, detailed step by step instructions, especially since there is no phone number provided for customer support. If you do have a phone number for customer support, kindly provide the number.
Alternatively, if you have a specific email address for customer support, kindly provide the email address.
Thank you.