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how to add a synergy 2150 handset to a Panasonic KX-TG8120E base unit?

I have a Panasonic KX-TG8120E and I want to add an extra handset which is a Synergy 2150.
It should be easy?! How can I make the phone recognise the base unit or the base unit recognise the phone? I have both user manuals but can't work it out. Help!
Nia, November 2013
Please anyone!!

Nia, December 2013
link Click here to see other fixes for Panasonic Synergy 2150.