On the Access rights tab, which is present when you have selected a new or existing dataset in a database table, you determine the access rights for this dataset and the objects in it, to restrict access to records, dependent on the user (login name in Windows) and its assigned role.
Click here for information on how to edit properties in general. On the current tab you'll find the following settings:

Access

Here you may define which Roles have which Access rights to this dataset and its fields. You can indicate for each role whether no access (None), Read access, Write access or Full access must apply. If a role is not linked to this dataset, then each user linked to that role has full access by default. A user without a role always has full access.

Users are assigned to roles in the application setup.

See also

Security in Collections