decal help

I know this isn't a tech question but i just got my decals today and i dont know how to put them on. i know you're supposed to use a squeegy but here's the question....

Is it a 2 layer or a 3 layer deal?

is it a 2 layer thing where the milky layer will turn clear or is it a 3 layer thing where where u have to peel off the milky looking layer?
 
its a 3layer thing you peel off the side on the reverse of the letters so that the siticky side is exposed. spry the car and that side with te windex then place it where ou want it on the car make sure when you squegge you start from the center and work your way out. once you have done that you can slowly pull of the oter "milky" layer. when you pull it off try to keep it as parrelle to the car as possible. also make sure the windex doen't have amonia in it. good luck
 
i sprayed water on the glass, laid the decal down squeegyed it and then i pulled it off but the decal didnt stay on the window.... what happened someone help? what am i doing wrong? i cleaned the window with windex first and then wiped it off