To edit/add your nickname or other information about yourself on LibChat do the following:
After you are logged into LibAnswers click on your email address to access the Manage Account.
Enter your nickname & save
To edit your email, name, nickname, password, or email signature, you must go to your LibApps account screen.
After you are logged into LibAnswers select "Go to LibApps."
You can edit your email, name, password, and signature from My Account.
To customize your profile picture, phone, number, email, etc. click My Profile in the command bar to customize your profile box.
More info: