You aren't turning the key? There is no battery? There is a giant boa constrictor choking all the air out of the motor? It's parked underwater at Sea World?
You have given exactly zero information to help solve your problem. Please try to give some more information on what is or is not happening, what it is doing and what you expect it to do.
Generally if a car doesn't crank problem is battery, solenoid or starter. If the car cranks but does not start then the problem is most likely either fuel or spark.