how to configure single emulator controls

[tardis]

im very new to retropie and linux in general.
I need to know how to set custom contoller configs, in particular for the nes system. i have a usb contoller and im running 3.0

the nes a and b buttons by default are hard to use.

thanks in advance

[herbfargus]

see this page on the wiki: https://github.com/RetroPie/RetroPie-Setup/wiki/RetroArch-Configuration

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