If you run through the group sign-up process quickly you probably missed the option to assign yourself a name within the group that is different than your email address. If so, please access the group forum and edit your name. We prefer real names rather than online handles!
Look for the "My Settings" icon in the upper right of the group forum page. Looks like a person with a gear cog next to their head. Click on that icon to reveal the drop-down menu list and then pick "Membership and email settings". In that window click on the name below "My display name" and enter a new name to replace your email address.
Thanks!