To add tracks to an existing playlist, please see the following instructions.
1. Log into your BeatStars account via the BeatStars app.
2. Next, click on the 3 dots button on the top right of the track you wish to add (see screenshot)
3. Then click the "Add To Playlist" option. (see screenshot)
4. Next, click the "+" button next to the playlist you wish to add the track to.