To use a proxy server on a Mac, follow these steps:Open the "System Preferences" menu on your Mac. You can find it by clicking on the Apple logo in the top left corner of the screen, and then selecting "System Preferences" from the dropdown menu.
In the System Preferences window, click on the "Network" icon. This will display the network settings for your Mac.
In the left panel, select the network connection you want to configure with a proxy server.