(Notice: If your screensaver is playing the latest photos instead of your playlists, please signout and signin again, that will fix it. How to sign out is here: https://webshots.groovehq.com/knowledge_base/topics/tray-icon-and-finding-out-the-version-number)
To access the Webshots Screensaver follow this handy guide from Microsoft:
The Webshots screensaver is called "Webshots4".
Here it is set to show after 4hrs of inactivity:
If it is not listed:
If your screen turns black after the screensaver has run for awhile check your power setting for "Turn off display"