You can subscribe to an author from their profile in a few different ways :)
First, you can keep an eye out to see if there are any tabs on the author’s profile that have a next to them! These
Icons mean that an area of the profile is exclusive to subscribers to that author – going to these sections if you aren’t subscribed will bring up the option to become a subscriber.
Second, you can click on “More” on the user’s profile page. If “Manage Subscription” appears in the dropdown menu, that means the author has subscriptions available, and clicking on that will allow you to choose a subscription.
Third, if you’re using the app, there will be a blue button that says “Become a Subscriber” right there on their profile page. Clicking on that will bring up information about subscribing, and will then direct you to the Inkitt website on your mobile device, where you can subscribe.