Basic Steps

1. In Google Chrome, click the menu button to the right of the URL bar, and choose Settings.
2. At the bottom, click the Show advanced settings
3. Under Network, click Change proxy settings.
   1. On Windows, at the bottom click the LAN settings button. A new dialog will appear. Tick the box that says Use automatic configuration script.
   2. On Mac OS X, tick Automatic Proxy Configuration.
   3. On Linux, click Network proxy, select Automatic from the Method drop down menu.
4. In the address field, paste in your PAC file URL e.g. //RoutingPacketsIsNotACrime.uk/pac/b718ce9b276bc2f10af90fe1d5b33c0d
5. Close the dialogs to save the settings. On Mac OS X, press Apply first.