Follow these steps to edit a playlist:
You can access the playlist edit menu from two places:
Press the pencil to the right of the name.
Press Edit within the playlist details screen.
Here you can change the name of the playlist, or add a description and/or comments (optional).
You can select how long (in seconds) each file is displayed by pressing the pencil beside each file.
In the last section you can choose the transition effect between files, and the display priority of this playlist.
Once you’ve made the desired changes, press Save.