First, place one leg on the wall, get it up there until you feel stable, and then move your other leg up to join it.
Walk your feet up the wall and bend your knees as you shake your booty. If you're really going for it, add a Miley face or hand signal for good measure.Additionally, you can get even a bit lower the ground, placing your hands above your knees, with your fingers pointed toward each other and your wrists facing out, and shake your booty with your hands helping you get the most for your money.
Try to keep the upper half of your body pretty stable. And don't worry if you don't have a big booty.
If you're comfortable twerking without your hands, then you can lift your arms straight out in front of you, close together and parallel to the ground, and gently sway them as you continue to twerk.
If you choose to keep your hands on your hips while you twerk, then you should press your thumbs into your butt bones to help push your hips go forward if you're moving forward to move your booty back, use your other fingers to pull back on your hip bones to help your booty move backward.