Before using rpi-wifi-bridge, you will want to make a few changes to some config files. See the overlay-boot and overlay-root directories for all available customizations. Even more are available by compiling yourself, see BUILDING.md.
1. wpa_supplicant.conf in overlay-root/etc
You MUST replace the example values in wpa_supplicant.conf in order to connect
to your Wi-Fi network. The values should be self-explanatory, just
replace country=us with your two-letter country code (e.g. country=gb) and
fill in your SSID and pre-shared key.
2. hostname in overlay-root/etc
You may optionally replace RPi-WiFi-Bridge with a hostname of your choosing.
You can of course modify any of the other files in overlay-boot and overlay-root and even add your own.
If you add files to overlay-boot, make sure to modify board/rpi_wifi_bridge/genimage.cfg accordingly!