Now you have your square cut off the bottom lining and keep it for later on!
Then with your long piece wrap that round the middle and sow it.
(make sure that you saw it at the back, so you don't see the stiches!)
Then put a bobby pin at the back through what you have sown then your done! (if you want to keep your bobby pin in then you can sow over it so it stays secure!)
So try it out! :)