Add Video List Item to Video List
First make sure all of your videos are uploaded to the Media Center. This can take time so be patient. The longer the video, the longer it takes to upload.
Go to Campaign> Edit> Opt-in Channels> Web Pages Tab > Scroll down and click button Launch Instant Builder 2.0.
Select the Video List page
Click the green + in the upper left hand corner of video section.
Click Video List Item object.
On the Insert Video screen:
Type in a Video Title
Type in a Video Description
Click button Click here to Select a Video or Embed Code of video you wish to correspond with list item (you may need to scroll down the Insert Video screen)
Your new video list items should appear on the Video List page