Apple Macintosh Performa 5400 Series - Manual (Page 132)

To install a communication card, follow these steps:
1 Remove the plastic access cover from the vertical plate.
2 Remove the communication card from its static-proof bag.
Hold the card by its edges to avoid touching the connectors on the card.
Communication slot
Push the two plastic tabs apart and pull off the
metal retainer so the access cover can come off.
Vertical plate
Metal retainer
131 Installing an Expansion Card