Following someone on Chillverse is instant — there's no follow request to approve, and no waiting on the other person. Tap Follow on their profile or post, and you're following them immediately; tap it again (it'll now say Following) to unfollow at any time.
Following someone doesn't change what they can see about you, but it does mean you'll get notified about certain milestones of theirs, like reaching a new rank or hitting a notable streak — a way of staying in the loop with people you care about on Chillverse.