1) carve
2) spin atleast 360 (slithly press the up arrow while spinnin if you wish to cork a bit from the beginning )
3)dont spin anymore, your skier will keep the spinning motion a bit, finish the corking by holding down arrow
4) you might need to press up arrow a bit when you land if you plan on turning it into a 9 or more (with a bit more spin obviously)
Looks like this 0:04