Push in the sides of the folded corners to pop out the back crease. Wrap the bottom flap around the head band about where you plan the final ear to set. Crease a fold where paper wraps around the edge of the band. To prevent gaps you want the front of the ear to be as flush with the front edge of the band as possible.
So decide where you think it should be positioned (you might want to finish both ears to this point so you can adjust them in relation to each other. Then tape them into place.
Cut your pink inner ear inserts (just eyeball it) and tape them in place with double stick or a tape loop. This helps hide the crease and the tape on the front of the ear while also adding dimension and detail.
Thats it! You can rock these babies all day and forget they are there. They are light and durable. If you want to up the details with paint, glue on fur or spray flocking you can really dress them up.