By adding your users into the correct user groups, and setting up access rights on each sheet, you will ensure what each user group has access to, such as viewing, creating, and modifying rights for entries on each sheet.
You can add new user groups to your Ragic account in your account setup, through Start tab > Account Setup > Manage Groups.
Alternatively, you can quickly add a new user group through the Design Mode while you are setting up access rights. This setting can be reached under Form Settings > Access Rights, by clicking on "Add User Group", under the list of your user groups.