Open Subscription from Quick Actions, or Subscriptions on the Money tab. Each subscription shows what it costs per month, and the total is at the top.

How a payment becomes a subscription
Any payment in the Subscription category is listed here, grouped by merchant. If one is missing, open the payment and change its category to Subscription; to remove one, change it to something else. See Transactions.
Tap Add Subscription to add one that has not been charged yet.


