Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 148)

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You see the Main tab of your printer settings window:
Note: For more information about a setting, right-click it and select Help .
4. For the Paper Source setting, select where you loaded the paper you want to print on.
5. Select the size of the paper you loaded as the Document Size setting.
Note: You can also select the User-Defined setting to create a custom paper size.
6. Select the orientation of your document.
Note: If you are printing an envelope, select Landscape .