QMS 2425 Operation Manual page 30

5 Align the media, and insert it between the media guides as
far as possible into the printer, with print-side up and the top
of the media going into the printer first.
See chapter 2, "Print Media," of the Reference for the print media
chart that indicates appropriate feed edge for each paper-size.
6 Make sure that the media does not exceed the limit mark on
the media guide.
7 Check the media guides to make sure they touch the sides of
the print media.
8 Adjust the media stop to the correct size.