Epson WorkForce Pro WF-C5890 Wireless Color MFP Inkjet Printer - Manual (Page 29)

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You see a window like this:
3. Select the number of optional cassettes installed as the Lower Cassette Unit setting.
4. Click OK .
The optional paper cassettes are now enabled.
Parent topic: Installing the Optional Paper Cassette Units
Enabling the Optional Paper Cassettes - Mac
You need to enable the optional paper cassette units before you can use them with the printer software.
Note: If you are using the PostScript (PS3) printer software, see the link below to enable the optional
cassette units.