When you sign-up for the forum, your screen name is initially the first part of your email address (the part before the '@'). If you don't want the public knowing this, you can change it using the following procedure:
1) Click on the grey single head icon in the top right, and select “My Profile”.
2) Click on the red rectangular button named “Edit Profile”. Though it’s not clear at this point that you can edit the screenname on the left, you should see a little pencil icon left of your screenname. Click within your screenname, and change it to whatever you want to be known as on the forum.
3) Click the red “Confirm” button.
Note: Once you have signed up for the forum with an email and password, if you go to log in again, please avoid signing up for a new account. Down near the bottom of the "Sign up" page find the word "Log in" and click on that.