If you still remember how a real Commodore 64 works, then I don't understand your problems. If you don't remember or have never used a Commodore 64, then you probably have to read the manual/info about the emulator.
I think that the most users of Commodore 64-emulators thinks that they are very user friendly.
Use CCS64 V2.0 or Vice 1.5, those emulators are the best in my opinion and many others.