1. Select the text or image desired to be used as the popup button and click the Popup Media button on the Text Editor Tool Bar.

2. Select the Media from the gallery and click OK to insert Popup Media into the text area.

Popup media is now added.

Test the popup in the editor via Ctrl+Click (Command+Click on macOS) the popup to test.  

To remove the popup click the remove the "#" in the Link modal via the Text Editor toolbar.