you need to run the car to bring oil up to temp, and then jack the car, take the small plug out of the centre of the draining plug, if fluid comes out, then level o.k.
if you are having problems with the gears "slipping" then it might be worth draining all the fluid out, and refill with 5lts of auto trans fluid, start the car, and with the brakes ON, go though all the gears, to allow fluid to settle thoughout the gearbox.
hope it helps
November 2010