STUDIO allows you to insert a video into your design.
Just as you would add a normal box, bring the cursor to the left edge and display the ADD panel.
Drag and drop or click the Youtube box to place it in your design.
How to change the video
It's very easy to change a placed video.
Select the placed video
With it selected, click on "iframe" in the upper tools menu
Then, the properties in the menu will switch, and paste the URL into the input field. Either, if you got the embed code of Youtube, paste the embed code into the property "Code".