first you need a working car & drive tool,Enter the car,equip the tool and press Y,To stop
press x ,and to steer click the mouse left or right.if this dosen't help you,go to the
ROBLOX WIKI

Here are all the coordinates of the game's special plane and driving tools.

Y = start
F = Fire
B = Bomb
C/S = Cloak/C = Put ship into lighting, and also cloaks you.
E = Extra Bullets
L = Ship-Straight
K = Ship-Rotate-Horizontal
J = Ship-Rotate-Vertical
T = Rollover
U = If stuck, twistover
X = stop(Not slow)
K+Z+W+Y = Suicide
I = Ship-Vector-Creator-90 Degrees
K (2nd Down) = Bomb ship if not on ship.
G = Put ship into lighning, taking u along with it.
W = OMG, LIGHTSPEED CFRAMES!(Lightspeed Plane(SpeedUp))
Q = Sets all ship speeds to zero
Z = Hard Brake (same as Q)

y is to drive x is to stop
also wen u press y n
click were u wanna go