Here is a simple exercise that should teach you to feel your GLUTE MAX.
Lie face down and take time to connect into the length of your torso, and the support of your abdominals, while you breath into your back. Bend your right knee so that your heel reaches up to the ceiling. Turn your leg out slightly - the knee will open slightly away from center and the heel moves slightly towards center. Keeping a long spine, even hips and maintaining the rotation of your leg, lift your knee off of the ground. You should feel your GLUTE MAX engage to make this movement happen! Try both sides - you may have one side that likes to work more efficiently than the other!