Samsung 6050 - Manual (Page 29)

Paper Handling 3-3
4. Fan the paper and load the paper in the cassette with the print
side facing down. The print side is usually indicated on the paper
package.
If you are using a preprinted stock, such as letterhead, place the
printed design side face down with the top edge of the page
toward the front of the cassette.
3. Push down the metal plate to load paper.
LETTERHEAD