It is pretty simple, it is called secured button.
If you want a page secured, right-click on the button that has the page jump assigned to it and check the box that says Secured.
When you press the button with the page jump assigned to it, a pop-up screen will ask you for the password, when you enter the correct password it will do the page flip.
We us this feature in TV lifts and motorized blinds all the time to keep the kidies from playing.

Jim.