Deleting Old Cover, Adding New

[Eugene]

I need help making my new cover (not the one pictured above) the main photo. Currently, it won't let me delete or replace the photo that's there, although it says I am a librarian and can make changes. Please assist.

[Cam]

Here's the alternate cover edition (we're not allowed to delete covers of published books, suggested to create alternate cover editions instead)
https://www.goodreads.com/book/show/2...

and to change the default edition please read this
https://www.goodreads.com/help/show/3...

[Eugene]

Thank you, much appreciated.