Any custom playlist created by you can be deleted from your user account.
From your web portal via dashboard.rockbot.com, click on the Music icon on the left sidebar. Select Add Playlist and click on Your Music section. Find the playlist that you want to delete, once you've selected it, click the Edit playlist button.
From the view that allows you to see all of the songs in the playlist, click on Edit.
Scroll until you see the Delete Playlist button. Keep in mind once you delete the playlist it will be completely removed and there is no way to recover it after it's been deleted.
You can also view all of your playlists directly here.
Keywords: remove delete playlist