Answered By: Justin Broce Last Updated: Dec 12, 2016 Views: 92
The following is from Bibliocommons Help:
"Your username must be unique, but otherwise you have a great deal of flexibility when you create a username. The name can be up to 24 characters long, and you can use any combination of letters and numbers, as well as underscores ( _ ). It cannot consist entirely of numbers, or use spaces or other non-alphanumeric characters. The best username is one that is easy for you to remember."
A username is required to register for the new catalog, but you can still log in using your library card number if you prefer.