Help asap squid with 2 nic cards setup

I found an old post that talks about 2 nice cards and it is driven by the IP address .... but I didn't understand it because the 2 people skipped information for me the newbie..
Can someone help me... I have the proxy server setup and I believe I have enabled the 2nd nic card, I just need one card to take the switch with the other computers and the other to internet. :confused:

Thank you

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