Some plans show the wings attached with rubber bands, but some of us like to modify the original design for bolt-on wings. Some of my short kits for such planes include parts for bolt-on wings. Not all, but some. If you get one of these kits, you will get parts that look like this:
The top left piece goes in the leading edge of the wing. The top right piece attaches to the spars. The bottom piece attaches to the bulkhead in front of the wing. A dowel goes through the holes. Go to my tutorial on changing your rubber band wing to a bolt-on wing for details.