Hello
edit recalbox.conf and add it, delete ;

https://github.com/recalbox/recalbox-os/wiki/recalbox.conf-(EN)

## Activate wifi (0,1) wifi.enabled=1 ## Wifi SSID (string) wifi.ssid=new ssid ## Wifi KEY (string) ## Escape your special chars (# ; $) with a backslash : $ => \$ wifi.key=new key