Remove 0 Value in Calculated Field

I copied the below question for another post here as it asks the question perfectly.

"I set up an invoice form to calculate totals from quantity x unit price. Every line has this formula, however the users may not have a priced item on every line of the form. My total column shows a $0.00 value until I input data. I'd rather have nothing show in that column unless quantity and price are entered. Is that possible?"

However, and I apologize, but I don't understand the answer that was posted. This is the first time I've needed a calculated field -- and I've not done scripting in Acrobat before.

Can someone walk me through the exact steps of how to enter and what to enter in the form to remove "0" values from the form?

Thanks, in advance, for any and all help.