Samsung CLP-365W-XAC - Manual (Page 31)

Media and tray
31 2. Learning the Basic Usage
6 Squeeze the paper width guide and slide it to the edge of the paper stack
without causing it to bend.
7 Close the paper cover.
8 Insert the paper tray.
9 When you print a document, set the paper type and size for the tray (see
"Setting the paper size and type" on page 34).