Press the button on the right side of the Apple Wireless Keyboard to turn on the device. The keyboard is discoverable when it's powered on. Click the 'Bluetooth' icon on your computer desktop and make sure Bluetooth is turned on. Click the Windows Start button, if you have Windows 7, and select 'Control Panel.' Click 'Add a Device' under the 'Hardware and Sound' category. The 'Add a device' window appears with a list of available Bluetooth devices. If you have Windows 10, click the Windows Start button and select 'Connect' from the menu that appears.