Higan Input Configuration

I’ve installed the latest Higan Accurate core to use with SNES. However I can’t seem to configure the inputs. I’m somewhat new to this - but I’ve loaded the core in RetroArch and have configured the inputs for player 1. But when I start the emulator the inputs don’t seem to work and there’s no in-emulator menu for configuring inputs like there is for mame (at least not that I can find). Any help would be appreciated. Thanks!