Can I change the "From" address in the Order Confirmations?

I am using GoldMine contact management software to keep track of my customers.

The way my existing shopping cart works is that it will send the order to my email with the person email address listed in the "From" spot.

I can easily click on create new account and it will. For all future orders as they come in it will automatically link the order to that customers and lsit the customer number etc etc.

I need to create customer numbers because I use Quickbooks for invoicing and managing the business financials.

Also, can I change the "Powered by "Zencart" at the bottom?