There's a label on the freezer next to the hinges. It talks about "watch out for flying objects when removing the hinges" (or something similar). It's pretty much useless as instructions go.
Take a look at the hinge - there's a hole in it that seems to have no purpose in life at all. If you put a big nail through that hole it will hold the hinge in the "closed" position. Mount up the hinges. Get the alignment right. Push down on the front of the lid. Pull the nails.