Need for Speed Carbon 玩生涯一開始有2部車帶住你話教你3種技巧..

When starting, they are teaching you the blocker thing, first of all, the screen should say something about activate the crew button, you press that button and then something will happen, you follow its instruction and then you are done.

I am pretty sure since I finish the game.

P.S. if not sure which button is the crew activation, check out your game manual. For PC, right ctrl.