Create multiple roles with the access rights that you wish to grant to your users.
To Create a New Role Navigate to 'Administration' > 'User Manager' > 'Roles'.
Press the 'New Role' button on the Main Toolbar.
Provide a unique 'Name' for the Role you are setting up.
If this is an Administrator Role, then set the 'Is Allow Full Access' checkbox to True. Administrator will automatically have access to all Modules and have the ability to edit the Application Model.
If Users linked to this role need to access the 'Application Model Editor', then set the 'Can Edit Model' checkbox to true.
Move on to granting 'Data Access Permissions' for the specific role under the 'Type Permissions Tab'.
See Add Type Access Permissions for more information.