How do you unlock smith corona electric typewriter?

I am not sure if you mean to unlock the case or to unlock it from the case that is holding it. I had one of these and to open the case you have two small levers on each side to open it. Push both at the same time. To take it out of the case you will find a hook in the back of the machine that you unhook. The hook engages a lever under the typewriter and you can lift it out. Turn turn on the typewriter you fill find the switch on the side ( right side if memory serves me right).