2.1. On the
Overview tab, click
+ Add videos (Fig. 4).

Figure 4
2.2. In the
Add sessions to window, search for videos to add. As long as you have viewer access to a video, you can add it to your playlist. Choose the videos you want and click on
Add (Fig. 5).
4.2.a. Once selected, you can opt to do the following:
Notify people, which sends them an email to let them know they have access to the video, and
Message, where you can type in a custom message to send to them regarding the playlist. Once you have done this, select
Send to share the playlist (Fig. 11b).

Figure 11b
4.2.b. The person or group will appear in the list of names under
People and groups (Fig. 11c).
Please note: To remove access to the playlist for an individual, select the X that appears to the far right of the user's name. If the parent folder for a playlist is shared with the user, you will be unable to remove access to the video until their access has been revoked at the folder level. Learn more at: How to Share a Folder. 
Figure 11c