Editing and reducing receipt size

am using an epson lx 350 dot matrix printer to print the receipt the size of an A4 half page. i want to remove that word invoice since in real sense its not an invoice but a receipt. i also want to edit the green and orange color to pure white since the printer is making the text there invisible. i also want to move the text created by to the left low before Outstanding balance as indicated in the screen shot below. please guide me no how to do it

To do these changes you need to edit the source code. Have a closer look at the following two files:

  • modules/Finance/invoices_view_print.php
  • modules/Finance/moduleFunctions.php (function invoiceContents)