How to become a Follower (not Worshipper)

#1
Hello everyone, my name is Green Flame (please don't burn me).

I have been interested in following certain authors in fiction, however I can never seem to find the button or command system where I could become a book follower. I was surprised other people were doing it so seamlessly.

Anyone know how to Follow a Book? Can't find the button for it anywhere on the screen.

Hope to hear some feedback. Please forgive this n00b.
~~Green Flame!