Make a backup copy of your database and store it in a secure place. On the File menu, click Open Database . Select the Exclusive check box, and then open the database. On the Tools menu, point to Security , and then click Set Database Password . In the Password box, type the password.
Passwords are case-sensitive.
In the Verify box, type the password again to confirm it, and then click OK . The password is now set. Each time a user tries to open the database, a dialog box appears that requests the database password. Caution Write down your database password and keep it in a safe place. If your database password is lost or forgotten, you won't be able to open your database or retrieve the information it contains.