Dell D31M Owner's Manual page 79

Steps
1. Lift the pull tab to open the PCIe door.
2. Place the communication card on the open PCIe door.
3. Route the communication card cable using the routing guides.
4. Connect the communication card cable to its connector on the system board.
5. Close the PCIe door.
Next steps
1. Install the side cover.
2. Follow the procedure in after working inside your computer.
Removing and installing Customer Replaceable Units (CRUs) 79