The web portal can be customized to suit your requirements. For more information on using Web Designer, please refer to the Web Designer Reference guide.
To remove the "White Pages" link you can make a copy of the component "VI_UserLogon" and remove the menu item there, or set a visibility condition:
An example condition:
The above example filters based on a specific Business Role, "Contractors".
Save your changes then compile the web project and test.