Configuration of Squid
Squid's main configuration file resides in /usr/local/etc/squid/squid.conf.
Open /usr/local/etc/squid/squid.conf file for editing and do the necessary changes. Most options are self explanatory.
Below you will find a fully working squid.conf file. Please consult the Squid man pages and the example /usr/local/etc/squid/squid.conf.default file for more information about the different options - the file is pretty well documented.