When you select the Save Playlist menu action from the Pop-up menu for the Playlist View, the Save Playlist window displays as shown below:-

Save Playlist Window
1. Playlist Title - type a name for the Playlist in the Title field provided.
2. Cancel - Select the Cancel button to cancel the Save Playlist operation and return to the Playlist View.
3. Save - Select the Save button to Save the items in the Playlist to a Playlist with the given title. You can retrieve the Playlist using the Add Playlist popup menu action in the Playlist View.