How to play multiplayer without Steam

I tried running NWMain ==> Multiplayer and I get the following error:
How do I fix this so I don't have to play on Steam?

How do I fix this so I don't have to play on Steam?

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Where/How do I enter the CD key so I can play without going through Steam?
This is after an hour of waiting... ( I am connected with green dot at bottom of client)
Thanks greatly for your kind assistance everyone. I don't think I would have found this otherwise.