From the Base

On the W60B/W70B base station, press and hold the signal button for 3 seconds.

The LED indicator for the handset will start flashing.

From the Handset

While the base is flashing, on the handset and from the home screen, press Reg

If the Reg option is not there, you may need to navigate into the settings of the handset.

Settings > Registration > Register Handset > Base 1

You will see the handset register via Easy Pairing once it locates the base unit.