Ok I usually do this off a kicker so ride up to the kicker (I like to go as fast as I can to get huge height but whatever you want) and when you get to the very end Ollie drag up and tuck your knees more than usual you have to really get down low to grab the board. Takes a couple tries but you get used to how low you have to go after awhile. If you don't touch your board you want to get lower. Its hard to grab the board but it looks cool if you do.

Good Luck!