You followed the following instruction to embed the Wall of Love, but nothing is displayed.
Most probably, you forgot to like ♡ them. Say for the video testimonial, you need to click the like button ♡ so to add the testimonial to the Wall of Love.
The same approach applies to all other items: text testimonial, Twitter tweets, LinkedIn posts etc. Please check this article to add each one to the Wall of Love 👇Add to Wall of Love