crystal11

i bought an already converted epson xp-15000 a few days ago. he told me that it already had the chipless firmware installed. i have no idea about printers or computers so how do i know if it has been installed? also do i have to buy it for my computer so that the printer works? and one more question what site or place do i go to inorder to print? this printer is a dtf/sublimation printer so he says.