I get a error message contact number is unregistered

I added a friend to my contact list and wanted to send him an imessage. I got the error this number is unregistered. How can I register his number so I can imessage him?

Hi,
On his iPhone he needs to go to Settings > Messages and enable the Messages item.
This "registers" the iPhone Number.
It takes a little while to "Verify".
10:01 pm      Thursday; June 5, 2014
​  iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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