To create a playlist in the BeatStars app, please see the following instructions.
1. Log into your BeatStars account via the BeatStars app.
2. While listening to a track, press the 3 dots on the top right corner of the screen to reveal more options
3. Click the "Add To Playlist" button. (see screenshot) 
4. Then click the "Add New" button. (see screenshot)
5. Next, enter your desired title in the "Playlist Title" field and then click the "Create" button. (see screenshot)