hoangx87
just put the roms into the appropriate folders (n64 roms in /share/roms/n64 for example) and update games list (under Game Settings) or reboot.
be aware, that some emulators are not available for certain architectures (for example there is no dreamcast emulator for Raspberry Pi2).
to see, which architecture has which emulator, have a look here:
https://batocera.org/compatibility