It's not complete - it's missing the rails that go between the two end pieces. I can't see well enough from your photos to be able to tell you what to do.
Once you figure out how to attach the rails to the frame, you can attach a strip of cloth to the rails (it can be stapled on, or even taped - I did that with my first frame). The quilt is attached to the cloth strip, which is also called a leader. Then the quilt is rolled onto the rails.
Best of luck.
Janet