If Guest Account is active, you can choose that, depending on what a guest is allowed to do.
How do I manage users and add passwords to my database in FileMaker Pro?
Answer ID: 5845Last Updated: Sep 20, 2011
Creating And Managing Accounts
Accounts authenticate users who are attempting to open a protected file. Each account specifies an account name and (usually) a password. Any user that cannot specify valid account information won't be able to open a protected file. Each file initially contains two accounts: [Admin] and [Guest]. NO PASSWORD ON EITHER