There may be a parking brake adjuster, loosen it off, see if it helps? Next, get at the rear brake assembly, if there is a star adjuster loosen it off, hopefully, that will loosen the brake pads? At the rear brake assembly, maybe you can get at the parking brake cable? I can't see anything from here. Safety is your responsibility, if you get brakes released, you need to make sure brakes work properly before driving, again.
Answers & Comments
There may be a parking brake adjuster, loosen it off, see if it helps? Next, get at the rear brake assembly, if there is a star adjuster loosen it off, hopefully, that will loosen the brake pads? At the rear brake assembly, maybe you can get at the parking brake cable?
I can't see anything from here.
Safety is your responsibility, if you get brakes released, you need to make sure brakes work properly before driving, again.