Epson Endeavor - Manual (Page 60)

Follow these steps to install an option card:
1. If this is the first time you are installing a card in the option
slot, you need to remove the metal cover for that slot on the
inside back panel. Remove the retaining screw securing the
option slot cover to the computer. (Keep the screw to secure
the option card to the computer.)
cover
2. Slide out the slot cover and set it aside. (Store the slot cover in
a safe place in case you remove the option card later.)
Installing and Removing Options 2 - 1 7