To add your subscription, firstly head to the Discount tab on your admin dashboard (Step 1), then select Bundles (Step 2) and finally either Add Bundle at the top right of the page or the Edit Bundle pencil icon, if you have an existing bundle to update (Step 3).
You'll be brought to the edit page, where you can scroll down to the payment options. Select the Subscription option, and choose the currency you wish to sell in, input the price of the bundle, and then choose either monthly or weekly payment instalments:
Click Save if you wish to keep the changes made, but want to keep it as a draft, to edit later. Click Publish if you are happy for your bundle to be made available to the public instantly.