Allows to assign a password any pages to protect from guests. You just need to go to Admin Backend > Pages and set password. After that guests must enter the password to view page.

After upload PagePassword folder to /Plugin or install from market, you'll see the plugin named Password Protected Page on Backend > Plugins section. Activate it. 

After the installation, go to Admin Backend > Pages and select any page. You'll see Password section bottom of page properties. Just set the password what you want. If you dont want to protect the page, leave blank.You can set a password for that page. If you want to remove the protect just leave blank and save.

NOTE: Password Protected Page hides only Main block.