To share a playlist, first click on 'Playlists' in the menu on the left hand side of the page.
1a. Click on the 3 dots next to a playlist and click on "Share"
1b. Click on the Playlist to show what videos are contained
2b. Click on the "Share" button next to "Play All". Make sure you don't click the "Share" button next to the video as this will only share the individual video.
Once you have clicked on "Share", you can change who can see the playlist by clicking on the dropdown menu. Click on "Copy" to copy the playlist share link.