To make your email address visible to others do the following:
#1 Click on settings, above on the right side in blue.
#2 Underneath the "My account" heading, click on "General settings". Its the second option below the my account header.
#3 Scroll down to "Messaging & Notification"
#4 Check this box and your email will now be visible in your profile to other members.
#5 Don't forget to click on the "save changes" tab at the bottom of the page after any revisions to your setting's.
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When someone clicks on your username the "@ send email" will appear.