Anyone using the PNG files Ali created for our use for DD?

I'm using the her PNG files from last year for the cover page in this year's DD album. I chose the blue "the reason why" file. I'm not well versed in Adobe at all but I did figure out how to edit and enter text. My problem is how to get rid of the printer marks. Are they suppose to be there when I print? And if so, are these the cutting guides? When I trimmed the paper, it's smaller than a 6x8. If someone can give me some pointers that would be greatly appreciated!! Thank you...