Changing Primary Image

Hi, I'm trying to change the primary image for The Cinzi Lavin Show from the current still from the production to a different one that simply says "The Cinzi Lavin Show." The message says I need to indicate which image I'd like to replace the current primary with, but there's no actual way to do that. 

This is the website: https://www.imdb.com/title/tt28970632/?ref_=tt_mv_close

I'd like the photo of the woman switched with the one that says "The Cinzi Lavin Show." (In other words, put the current primary photo in with the other stills from the show.) Thanks!