There have been some confusion (perhaps bad design) regarding the pairing mode of this keyboard. If the blue light blinks rapidly, it is trying to reconnect with the last paired device (which may happen brand new out of the box as we test each and every unit prior to shipping). In actual pairing mode, the blue light will blink SLOWLY to indicate the keyboard is ready for pairing.
To put the keyboard in pairing mode, please hold down the (FN) key along with the (minus/dash) key (Fig. 01) for a few seconds until you see the blue indicator light start flashing slowly. Once this happens, the keyboard is properly in pairing mode.
Fig. 01 / Bluetooth Pairing Mode Activation.