Subscription cancellations must be completed via www.btwb.com. Sign into your account and head to your Profile drop-down menu in the top-right hand corner of the header, then select Subscription. You will then be able to view all of your current subscriptions, including any btwb subscription, coaching program subscription, and macros add-on.
Select "Cancel subscription" on the subscription you want to end.
Once you cancel your subscription, all your info, data, and logged results will remain saved to your account. If you ever want to come back to btwb, you'll be able to pick back up where you left off.