Flip the wireless switch located at the front of the Dell Vostro, to the left of the speakers and headphone connections, to turn on all wireless connections. If you cannot find a wireless switch, hold down Fn and 2 to turn on wireless.Click Start.. Right-click Network..lip the wireless switch located at the front of the Dell Vostro, to the left of the speakers and headphone connections, to turn on all wireless connections. If you cannot find a wireless switch, hold down Fn and 2 to turn on wireless. Click Start..