How does the Password Protect service work?
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You must place the Login Form code on the page you want people to log in from, and add the Security Code inside the header of all the pages you want to protect.
A visitor will complete the online form and click on the "Login" button. The visitor is then shown the webpage that you selected to be viewed with that login.
The Password Protection system allows you to assign a username and password to pages, not people
Now if you don't want access to these pages/listed in your menu of pages then remove them
People can still get around this and bookmark the page so they don't have to go through the login also.