Do you have a freewheel bike? Here's what to do:

With the cranks at the 9 and 3 position, turn your front wheel about 45 degrees in towards the forward pedal. Now you need a slight uphill - the trick is to balance the force that you put on the pedals with the force of the bicycle rolling backwards on the hill.. don't lock the front brake. You need a slight back and forth motion (with time this motion becomes hardly noticeable, this is when you learn to stay in the 'zen' point). So locking the front brake would kind of defeat the purpose. The 45 degree wheel tilt is so that this back and forth motion also takes you side to side, which makes it easier to balance.

Anyway, keep working at it. Sorry if I made it sound complicated. You'll get it in time.