Now the how to.
First, back combing or back brushing either works. The trick to it is to hold the ends very loose and kind of scoop as you comb/brush backwards. You don't need to do your whole head just the top and front part of your sides.
Next, With a brush using just the edges of the bristles to smooth out the top of the hair being careful not to brush out all your back combing. Brush it back into your ponytail and secure really tight.
Then, grab the hair at the crown and pull up and forward just a bit it create some height in the crown.
If you want to add a head band do it now and just make sure you still have the height in the crown area.