The file you need to edit is in /opt/retropie/configs/all/
To auto config:
sudo chown pi /opt/retropie/configs/all/retroarch.cfg
cd /opt/retropie/emulators/RetroArch/installdir/bin
sudo ./retroarch-joyconfig -j 0 >> /opt/retropie/configs/all/retroarch.cfg
(If -j 0 doesn’t work try -j 1)
