How do I find my next billing date?

All your payment information can be found on your Account page.

Login to the members site, and click on your profile icon in the top right to go to your account page.

Click on "Subscriptions" to view your active subscriptions. 

Under the "Subscriptions" column you will see your next payment date.

You can view your previous transactions by clicking on the "Payments" link inside your account page.