[Koha] Printing a circulation receipt

How does one do this in Koha? (v 3.0000107) After checking out an item, we have the option of printing a page or a slip. This simply creates a new web page. Is this the correct procedure? If so, we've just attached a POS-X receipt printer via USB, but it did not come with any drivers, so it doesn't show up as a printer. Any guidance? Thank you, Cab Vinton, Director Sanbornton Public Library Sanbornton, NH