Sign in to your YouTube account
Open a video you want to add to a playlist
Click the Save button below the video
Select Create new playlist
Enter a playlist name
Choose the privacy setting
Click Create
To add more videos, click Save on each video and select the playlist
To view your playlist, go to Library and open the playlist
To edit your playlist, open it and use the Edit or More options
To share your playlist, open it and copy the playlist link