You become the System Administrator by setting an Administrator Password in PC Access. To do this, click the Setup button on the Main Menu window. Click the Advanced button to display the Advanced Setup Menu window. Click the Defaults button to display the Defaults Setup window. Enter a password in the Administrator Password field near the top of the window. See Defaults Setup.
Until you enter an Administrator Password, anyone can run your copy of PC Access and open any setup window. However, once you enter an Administrator Password, you restrict access to everything under the Setup Menu button. Thereafter, to change any part of the PC Access setup, you have to enter the Administrator Password. (This works the same way for all versions of PC Access.)
Therefore you must remember your Administrator Password. You must also keep it a secret from everyone else in your office, to prevent a security breach. If an unauthorized person obtains your Administrator Password, they can change the PC Access setup, including the Administrator Password.