Configure PFSense to block Certain Webpages

Currently have a PFSense system setup at the office. Would like to block certain website from internal use (for example, [login to view URL]). I believe Squid needs to be installed and configured, however I do not know exactly how to do this. I will provide remote access to the router and let you configure the blocked webpages. I will provide a list to start and I must know how to edit in the future. ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform PFSense **1.2.3-RELEASE**