Yes, you can edit a playlist as many times as you want. However, after you activate premium options with points, you will have a 24 hour period to complete changes. After these 24 hours, the playlist will become locked. You will be able to edit the playlist "as new" afterwards and publish it again as a different playlist. With a Premium membership you can permanently edit all your TubeSnack playlists for as long as you keep your subscriptions active.