Car shifts in gear but wont drive?

make sure car is on level ground...open hood...pull transmission dip stick...check Transmission Fluid level...if low, fill to cold fluid level on dip stick.....start the motor..let the car warm up....check fluid level again....fill to hot level on transmission dip stick....use manufacturer's recommended transmission fluid........usually instructions are on dip stick... make sure car is on level ground...open hood...pull transmission dip stick...check transmission fluid level...if low, fill to cold fluid level on dip stick.....start the motor..let the car warm up....check fluid level again....fill to hot level on transmission dip stick....use manufacturer's recommended transmission fluid........usually instructions are on dip stick...