how to connect to another wifi network

[Lpoolm]

so i am in the process of getting my build together, struggled to follow the guide on how to set up wifi in wermys tutorial so just connected a keyboard within the usb when all open and connected the old fashioned way.
but my question, i am planning on giving this to my nephew but how can he connect to his wireless in his house without needing to open it up and removing the sd and attempting to do what is in the guide?
thanks

[wermy]

You can add a wpa_supplicant.conf file to /boot, with his wifi SSID and passkey in it - it will automatically add those wifi settings when you boot up. You can even add multiple networks in there if you want. There is a sample one in the setup script bundle on the wiki.

[Lpoolm]

You can add a wpa_supplicant.conf file to /boot, with his wifi SSID and passkey in it - it will automatically add those wifi settings when you boot up. You can even add multiple networks in there if you want. There is a sample one in the setup script bundle on the wiki.

thankyou boss man!