If your Bluetooth device won't connect in Windows and you receive Can’t pair Bluetooth keyboard, Check the PIN and try connecting again message; see this post.

How to Activate Bluetooth on ASUS. You can utilize wireless technology to streamline your work habits. Using Bluetooth, you can quickly connect wireless peripheral devices like mice, keyboards ...

On a Mac, you can just hit the Bluetooth icon in the menu bar and hit "Set Up a Device". Your computer will scan for devices, and your keyboard or mouse should pop up.