Basically you can only follow artists and labels. Each track or release has a FOLLOW button. Also at all 3 points the following is selectable. If there are more than one artist, you can follow several artists at the same time. Your followers are listed in the menu MY FOLLOWINGS and can be unfollowed there, as well as directly at each track or label or artist page.
You can follow from any Release
Or follow from any Track
Manage your Followers