This is where you can learn How to Add an element. You can add an element from here.
ADDING AN ELEMENT
Select Add Element and then Media Type you would like to add.
Specify Source
Note: You will not see the above if you're adding Content, Map, Module, or Frame.
Instead, you will be asked to either Author Content (Content), Map Settings (Map), Select a Module (Module), or provide Internet URL (Frame)
Specify Thumbnail
Note: You will not see the above if you're adding Picture since thumbnail is created from the Picture Source itself.
Specify Properties
You can add the Title, Caption, Tags etc. to specific element
Add .That's it you added your first element.