You should use 12 #64 rubber bands to attach the wing. Use 4 on each side going from the front peg to the back peg. Then on the last 4 criss-cross them across the fuselage. Go from the front right peg to the rear left peg, and the front left to the rear right. Criss-crossing them will ensure that all of the rubber bands stay on and don't work off in flight.

Hope this helps

Ken