When your site was initially set up, your library's launch manager worked with an administrator for your site to identify the information that would be collected and required to sign up for Beanstack.
If you would like to add or remove fields that are collected, you may update these by going to Setup > Site Options > Registration Fields > Display or Require Fields.
Note: You will not see the option to update username or email there, as those typically "unique identifiers." You may contact our team by submitting a ticket if you want to inquire about change the requirements for these. If you are using something like "email" as a unique identifier for login, then we would not be able to remove email as a required field. We generally recommend sticking with the collected fields as much as possible to avoid confusion or unintended consequences.
Our team will help ensure that certain fields display or do not display per your request, however, some fields do require that you enter options for someone to select. For example, you must first add branch options before branch would appear at registration. See this article to add answers for registration fields.