Epson EISA Desktop - Manual (Page 81)

3. Insert the card into the slot with the connector pins pointing
down, as shown below. If you are installing a full-length
card, insert the other end of the card into the appropriate
card guide near the front of the computer.
Push the card downward firmly to insert it as far as it will go.
4. Secure the end of the card to the back of the computer with
the retaining screw.
Removing Option Cards
If you need to remove an option card, reverse the steps outlined
above. Be sure to replace the option slot cover over the empty
slot to ensure proper airflow inside the computer.
5-6 Installing and Removing Options