i dont know how
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Click on the member's name. That will take you to their page.On the left, you will find a button for "private message". Or you can scroll down and add to their "Orangeboard".(This is not an invitation to practice on me.)
Click on their username wherever you find it (as the author of an Instructable, in a comment, whatever). That takes you to their profile (here's yours). Under their picture (avatar) you'll see a button labelled Private Message. That's the equivalent of e-mail, and is only within Instructables. The site does not make users' actual e-mail addresses available to anyone.