Epson AcuLaser M2300D series User Manual page 62

Epson AcuLaser M2300/M2310/M2400/M2410 Series User's Guide
5. Pull the paper cassette out from the unit.
6. Turn the lever to the position as shown below to lock the optional paper cassette unit.
7. Insert the paper cassette back into the unit.
8. Reconnect all the interface cables and the power cord.
Installing Options 62