I don't have Madden 07 for the Wii at the moment (let a friend borrow it since I have 08), but I want to say it was left on the analog stick. If not that, then another direction. If not that then it's a combination of C or Z and pressing the analog stick.
Sorry my mind is sketchy, but I just know it has something to do with the nunchuck. Little funny that the manual doesn't say how to do such details, and that oddly there are no FAQs online covering it.