Hey can anyone teach me how to print my rendered image

well first you need to know what the mazimum size you intend to print at, and what dpi (8x10 @300dpi for instance). Then do some mathโ€ฆ2400x3000 is your output render size. Take that into Gimp, or photoshop, set your canvas/image size to 8x10 at 300dpi. Then print it. iPhoto works well for printing, though less customizable, if you have a mac.