To change your Display Name;-
Go to your profile, edit, change the Nickname to whatever your want, save this with the Update Profile button at the bottom. Then in the Display Name popup you can select this new Nickname, and save with the Update Profile button again.
To change your Avatar image;-
Go to http://gravatar.com and sign up with the same email address you used for this forum. Then on gravatar you can associate any image you like with your email address, and when gravatar approves it, it will show up on this forum.
