Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 170)

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You see a screen like this:
4. Select the number of optional cassettes installed as the Lower Cassette Unit setting.
5. Click OK .
The optional paper cassettes are now enabled.
Parent topic: Printing with the PostScript (PS3) Printer Software - Mac
Related tasks
Enabling the Optional Paper Cassette - Mac
Selecting Basic Print Settings - PostScript Printer Software - Mac
Select the basic settings for the document or photo you want to print.
The PostScript printer software supports plain paper printing on these paper and envelope sizes:
• A4 (8.3 × 11.7 inches [210 × 297 mm])
• Letter (8.5 × 11 inches [216 × 279 mm])
• No. 10 (4.1 × 9.5 inches [105 × 241 mm])