Your user display name is the name that is displayed on your profile page and as the author on blog posts and comments, to users and viewers of your SocialGO site. It is the full name you give at registration.
To change your display name (full name), click on your name in the top right-hand corner of the top bar of your site. A drop-list will show up. Click on 'Account settings'. In the Account settings window, simply edit the name in the Full Name box.
Please note that if you do not specify a Full Name, your username will be used instead. You cannot change your username.