How do I pause a subscription?

You can turn on the option to show the pause button in Seal Subscriptions -> Settings  -> Customer portal -> Subscription editing. 
After you turn this on, your customers will be able to pause the subscription (in addition to cancelling and reactivating it) in the customer portal. 
You can then pause and resume the customer's subscription by going into the customer's portal and clicking the Pause subscription button. A link to the customer's portal can be found in App settings -> Subscriptions -> click on a subscription -> Access customer portal. 

You can also cancel and reactivate the customer's subscription by going into the customer's portal and clicking the Cancel subscription button. 
The subscription can also be cancelled by opening it in the Seal Subscriptions app and clicking on the Cancel subscription button.