Once logged in, click on 'Your Subscription' at the top of the page. From the 'Your Subscription' page, you can make any and all adjustments to your subscription.
Once logged in, you'll see 'ACCOUNT' at the top of the page with an arrow next to it. Click 'ACCOUNT' to reveal your account and the ‘Your Subscription’ tab. From there click 'Your Subscription' to edit all of your subscription info.