How to install nxFilter on Netgate 3100

  • I'm new to Netgate and pfSense and nxFilter.
    I want to install nxFilter on my running Netgate 3100.
    How do I do that?
    I find very old instructions, but nothing with current versions, etc.
    Please help.
    I want to be able to filter out sites by users and groups for a small school.