Question: john gbc how to use?
Answer: Step 1: Get Emulator. So to begin, go to the play store and search: John GBC Lite (its free) and download it. Put it on your home screen. ... 
Step 2: CoolRom.com! Open up you browser and copy-paste coolrom.com into it. ... 
Step 3: Enjoy Your 8-bitty Goodness! Open up John GBC.