The system is protected with data access control. It can restrict the unauthorized users from having full access to the database by limiting their access to certain management or confidential information. Every user can have a different access authority to the Forms, Lists and others. In order to do so, enter the File Menu and select Security. In the dialog box, enter the prime user name in the "Admin Name" field and then a password in the "New Password" field. The "Old Password" will not be required at this stage but for the future when it is needed to change the password. The Admin Name person would be the only one who can enter and control the level of access for each user.
Every user name and password must be entered in this dialog box, and then every user to be allocated with the required Lists and Forms access according to their job responsibilities. This can be done through keeping the checkbox, checked or unchecked.