How do I add a Google Gmail sender to my contact list address book?

Your confusion is understandable, because like so many features in Google's splendid Gmail service, what you seek is hidden under the innocuously labeled More options link.

To accomplish what you seek, simply open up a message from the sender who is to be memorialized in your address book. The head of the message will look like this message from my friend Scott Allen:

Click on "More options", though, and suddenly there's a world of choices:

You can see the option you want: Add sender to contacts list. Assuming everything works properly -- and it should -- you'll now see a status message above the email:

That's all there is to it. Hope that helps you figure the "one click" solution!