Dell H815DW User Manual page 274

6 Align the paper guides against the edges of the print media.
7 Insert the MPF into the printer.
8 On the touch panel, tap Size.
9 Tap or until the desired paper size appears, and then select the size.
10 Tap Type.
11 Tap or until the desired paper type appears, and then select the type.
12 Tap OK.
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