Hi, recently got an RG552 myself and relatively a newbie myself. To run a game in android, I select the emulator app I want to use (for eg if I want to play Metroid Fusion on GBA, I open GBA.emu app from the main screen).
The first time you run an emulator you need to tell it where your games are stored. Once the app is open, go to ”load game”, then click the grey bar tile at the very top of the screen so you select the file path to your sd card to tell the emulator where your ROMs are stored. It would go something like this:
- Open app then ”load game”
- Click grey bar at top tuntil it changes blue and says File Location
- Select SD Card
- Choose whichever folder your roms are stored eg in Metroid Fusion GBA case, I would choose GBA folder
- Then click the game you wanna play.
- Enjoy it!
You only need to do this once the first time, just to tell the emulator the File path to find your games. As far as I know every emulator works the same way.,
As for RetroArch, you need to download Cores for whichever system you want to use. Not used it myself, but you need to be connected to Wifi to do this as far as I know.
These things can get complicated for beginners but you’ll pick things up really quickly, hope that helps
cheers.