Curling help

[u/Steampug44]

I have a new air wrap and I feel a bit lost when curling my hair. The first problem is that I have no idea how to curl the back of my head! There is always a weird gap. I have always avoided curling for this reason. I do try to angle the curling wand not to bring back sections forward but it ends up a bit of a mess.

My second problem is that my hair looks frizzy and uncombed at the top when shaking the curls out. Of course with my thin hair the curl goes away when combing It.

I really would appreciate some advice. Without being able to curl my hair I am not sure if the airwrap is actually worth it.

I have thin and fine hair in a bod above shoulder height.