Instructions
Double-click the "World of Warcraft" icon on your desktop.
Click "Play" after any required updates install.
Log in to your "World of Warcraft" account. After the servers verify your password, it will ask for an authenticator number.
Press the button on your authenticator to display a six-digit number. This button is the only one on the device so it cannot be missed.
Type in the number into the field on the screen. This number is only active for 60 seconds, after which you must press the button again to receive a new number.
Click "OK" to login.