How do I create a pause menu in a game?

Cannot create a pause menu, how can I?

Not a whole lot of information to go on here, but maybe this will help you more generally: https://www.scirra.com/tutorials/search?q=pause%20menu

On P pressed --- System - Set time scale to 0

---------------------- Pause image set visible

On C pressed --- System - Set time scale to 1

---------------------- Pause image set invisible

That way really doesn't work if there is active objects invisible, they are still usable which makes it pretty hard when making touch screen game. Any method to make these objects not-usable when not paused and usable when paused?

What you mean by usable?

You can put the objects inside a group then deactivate the group when P pressed and set time scale to 0.