Please make sure you have created and enabled the subscription model before proceeding.
Note that you need to create the subscription plan relevant to the segment before you can add it within the segment.
To create segments, please check this article on how to create segments
How To Add Subscription Plans Within Segments
Now, click on the add contents button in the segment creation flow.
Click on the Add Products button
Now, add the subscription as your product into your segment and click on Save changes.
Now, click on Publish to make the segment go LIVE.
Read this implications guide to know the major changes that will happen when you switch to subscriptions.
How Students Will View Subscriptions
After publishing the subscription, let us login to the academy as a student and click on a segment
Now, click any course and click on the Go Premium button.
On the next screen, you will find the subscription and the tiers.
Read this guide to know how your learners can purchase courses when you switch to subscriptions.