How do I add videos to an existing playlist?
All users that have "manager" permissions on a channel can add channel videos to an existing playlist.
For directions on how to create a playlist see: "How do I create a playlist?"
Click on the channel that contains the playlist
To the right of the playlist you want to add videos, click the pencil (edit) icon.
Click the "Add" button on the top right of each video you want to add to the playlist. When finished, click Save
This saves all of the videos you have added to the playlist as part of the playlist and returns the display to the playlist editing page with the number of videos in the playlist increased.
For directions for copying the playlist embed code see: "How do I copy a playlist embed code?"