On the ground, the rudder and the nose wheel are interconnected. If you don't have a joy stick, stop and get one. The best way is to have rudder pedals. The next best way is to turn on auto rudder and use your (left/right) movement of your joy stick. You could also use the twist motion of your joy stick if you are so equipped but I never liked that. The last resort is to use the number pad(Num Lock-off), zero is left and enter is right. In my opinion, FS is useless without a joy stick.