Reply To: Getting WiFi working with RetroPie?

[karloss]

the process is exactly the same as raspbian…

Step 1.
Boot the Raspberry Pi without the WiFi adapter plugged in.

Step 2.
Open a Terminal session by clicking on the LXTerminal icon, and enter the
following command into it:

sudo nano /etc/network/interfaces

Then Edit the file to look like this –

auto lo
 
iface lo inet loopback
iface eth0 inet dhcp
 
allow-hotplug wlan0
auto wlan0
 
 iface wlan0 inet dhcp
        wpa-ssid "ssid"
        wpa-psk "password"

Step 4.
When you have finished press [ctrl]x. This will ask if you want to save the modified files.
Press ‘Y’ and then Return to save the file with the same name.

Step 5.
Shut down your Raspberry Pi, plug the WiFi adapter in and start it up again. You should find that the Raspberry Pi connects using the WiFi adapter as it boots up.

job done :)