How Can I make it not boof my hair?

I'm having athletics day tomorrow and my colour is pink and i brought one of these hair accessories;

http://tinyurl.com/2hg4yj

http://tinyurl.com/2ezfgq

everytime i put it on.. the thing kind of goes up and makes my hair boof. how can i keep it still? thanks . any help or suggestions or tips appreciated. :)

How Can I make it not boof my hair?

umm. try to use bobby pins?

or, try pulling the hair down while doing it...

i think its supposed to poof at the top. ? :/

thats a boy in the pictures :D

How Can I make it not boof my hair?

Bobby pins and hairspray or go to a hair salon for help.