SYSTEM PREFERENCES

Turn off the firewall. Try rebooting the computer. Can't offer much help without you providing more information. Just relating what doesn't work is not helpful. We also need to know what happens when you are trying to use software or hardware that doesn't work. We need clear and thorough descriptions. Please read Writing an effective Apple Support Communities question. We are here to help. We are all users. We are not mind-readers nor clairvoyants. We only know what you write down and tell us. Be specific and thorough. Include your hardware information and installed version of macOS. Try to write clearly. Think about what you want to say before you write it down, then re-read it to see if it makes sense.