Just to clear up any confusion over what a bunnyhop is: A bunnyhop is when you lift both wheels more or less at once (what is taught in this instructable). In some videos people do what is actually called a mountain top, where you lift up the front wheel, then push off from it, and call it a bunnyhop. (Thanks Aron313 for correcting me)
The photos aren't of me, I wish I could hop that high... I don't really think that photos show much anyway, they just confused me even more when I was learning.
Step 1: Lifting the front wheel
Pull up on the handlebars, and right before you do put your weight backwards. The front wheel should come off the ground for a bit. Your elbows should bend a bit aswell.
If you can't lift your handlebars up, then you aren't using your weight properly. Lean back more when you pull up on the handlebars.