Bimco, IMO & Rosetta Stone require that library staff set up your account. You can sign up for those here.
Many databases allow users to create accounts in order to provide a personalized experience, such as remembering bookmarks and annotations, or allowing users to "borrow" an ebook (download for offline reading for a limited time). Patrons are free to create their own accounts in these systems, with their own choice of user names and passwords. However, having a personalized account in is not usually sufficient to gain access. Users need to be on compass or validated via the EZ-Proxy service, at which time they can log in for their personalized experience.