Film Trailer Featurette Help

I just uploaded a featurette of my film trailer. How do I change the thumbnail? I'm on IMDB Pro but I don't see a way to edit the video or change the thumbnail. Second, I want to delete the original trailer featurette because it has old information. How do I delete it? 

Here's the videos page:  https://pro.imdb.com/title/tt21876766/videos