[red_and_white]

Hello,
I'm not good at PHP at all.
Well, my problem is this.
I want allow customers to estimate shipping charges.
As default, XC make mandatory only Country field and State. Instead, I need Country and zip code to be mandatory as I create different destinations zone full of zip code. So it's very important that customer digit his zip code to get the right shipping charges. I know they are supposed to be "estimated" but I want to give customers an excellent experience on my store.

Someone can help me please?