I just got a Raspberry Pi (in a kit) and installed Arch Linux on it. I plugged in my WiFi dongle (which came in the kit) and I see that Linux has the driver for it.However, I still cannot connect to my WiFi network. I used wifi-menu and I selected my network. I entered the password and hit enter. After a few seconds (~10), I got an error: Connecting Failed! Do you want to save the profile MyWifiNetwork?Is there something else that I have to do? 
Connect to wifi using wifi-menu
arch linux;wifi;raspberry pi