Dell C1765NFW MFP Laser Printer - Manual (Page 65)

Loading Paper 63
4 Load print media on the PSI with the top edge first and with the recommended print side facing up.
5 Adjust the width guides until they rest lightly against the edges of the stack of print media.
6 Select the paper type from the printer driver if the loaded print media is not standard plain paper.
If a user-specified print media is loaded in the PSI, you must specify the paper size setting by using the printer
driver.