RaspberryPi - Setup Wifi on Raspbian

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

Step 2.
vi /etc/network/interfaces

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 3.
Plug in WiFi adapter and Reboot