
As has been said - keep your weight lower.
And turn with your shoulders - the rest will follow. Point where you want to go - you'll look a bit weird, but it does help.
And lastly, it looks like you had your weight a bit too far back on that wave - hence the board thrashing about underneath you. Crouch down, weight that front foot a bit more, and you should be able to ride out that bit of whitewater.
