How To Re-Locate Barcode

I was wondering if anyone knows how I can move the barcode to be displayed above the word INVOICE on all invoices? It puts it at the bottom of the pages currently and many times causes an extra page to print. I think the other location would be better, especially since there is enough room there.

I would appreciate any help on how to do this. I know some things, but am a novice still at the programming.