Once you enter fingerprint manager, you can tap the+ button to register more fingers. Galaxy Note 4 allows you to register up to 3 different fingers.
But actually you can use different fingers for each registration, i.e., you can use different fingers for the 10 strokes. So, it is easy to register your 5 fingers without losing accuracy.
To manage the saved fingerprints, you can tap and hold the name of the fingerprint as shown below. This will make it selected.
Once the fingerprint is selected, you can tap the pencil icon to edit, or the dustbin icon to delete it. Both icons are in the top right of the window.