After gluing on the gray pieces to the bat wings, gently fold the bat wings so that the wings have a curved shape to them (almost like an accordion). Younger children might need a little help with this part.
The next step is similar to step 5. You need to cut the rectangle strip in half on the dotted line.
The two sides will then be folded on the dotted line and will be used to give the bat wings a little bounce to look like they are flying.