You can edit a playlist in these ways:
Editing a Playlist from the Playlist Folder
From the left sidebar, click Playlists to see the saved playlists.
Click on a playlist.
From the Details pane on the right, click Edit Playlist to open the playlist dialog box.
You can then use the playlist dialog box to edit the playlist.
Editing a Playlist from the Home Screen
This assumes that you have recently accessed a playlist or have added it to your favorites.
From the Home screen, under Recent or Favorites, select the playlist tile.
Click the menu on the tile.
Click Edit Playlist.
You can also edit a playlist by adding routines to it. For more information, see "Adding to a Playlist".
You can also edit any playlist with the Edit Playlist option available from the menu on any playlist tile.