Image Steganography

I’m working on an image steganography challenge.
here’s the image we’re working with:

I think the flag is in part of the image where its all pixelated/corrupted(bottom right corner), but i’m not sure how to recover the flag from that. Maybe using GIMP , but i dont know any commands on there to do that stuff to an image… also when i first open the image in gimp, this error message pops up:

pretty sure that has something to do with the corrupted part of the image. but then again, how do you even recover it???

hopefully someone can help me with this one!