Epson Epson - Manual (Page 87)

3. Hold the card along the top corners and guide it into the slot
Once the connectors reach the slot, push the card in firmly
(but carefully). You should feel the card fit into place. If it
does not go in smoothly, do not force it; pull the card all the
way out and try again.
4. Replace the slot cover bracket by inserting it into the small
metal holder below the option slots; then replace its
retaining screw.
5. Replace the computer’s cover as described under “Replacing
the Cover.” Then see “Post-installation Procedures”for
instructions on configuring your computer with your new
option card.
4-24 Installing and Removing Options