How do I Switch Site Subscription from Monthly to Annual?
To upgrade an existing site subscription from monthly to annual:
Locate the site on the Dashboard.
Click the settings () icon next to the site.
Click Payment Info from the drop down.
Select a new plan.
Click Switch.
Note
The billing platform does not have a way to allow you to downgrade or cancel the Store add-on. Instead, simply cancel your subscription and republish the site in order to make this sort of change.