How do you do fly over the clouds in dragon fly

A friend of mine whom got over 36k points, says you only need to play for a while, and sooner or later you'll get it.
Me on the other hand got tired after a while and bought the speed-potion. After buying that you only need to start the game and you'll see a sign on top of the screen that says "you drank a speed potion, you now have 2 doses left". After that, just be in fire-mode, hit the speed vials in game, and you should now be flying like after a 6-pack of redbull ;)