Dell EMC PowerEdge XE8545 Installation And Service Manual page 77

Figure 76. Removing the expansion card riser (Riser 2)
4. For Riser 4, loosen the captive screw on the riser, and then press the blue release tab on the riser, and holding the touch
point lift the expansion card riser from the riser connector on the system board.
Figure 77. Removing the expansion card riser (Riser 4)
Next steps
Replace the expansion card riser.
Installing and removing system components 77