When I try to send an iMessage from my iMac to her iPhone (text) I am told her number is not registered. How do I register?

When I try to send an iMessage from my iMac to a friend on her iPhone (text) I am told her number is not registered. How do I register?

This thread provided someone with a near identical problem a solution.  Hopefully this helps you
https://discussions.apple.com/thread/5844705?tstart=0

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