In EdPuzzle, click the Share preview action seen in the sample screenshot below:
In the window that appears, under the Embed a preview of this video on a site section, click the Copy link action.
Then, in eKadence, open your content editor and switch to the Code View mode by clicking on the toolbar icon highlighted in the sample image below:
Paste in the embed code that was copied from EdPuzzle, and then, to change back to the regular editing view, you can click the Code View icon again - or simply click out of that content editor - and then the page will update the display and attempt to load your new, embedded content.