QNAP TS-1635AX - Installing Expansion Cards

c. Attach the flat head screw to the riser screw.
7. Attach the case cover.
a. Slide the cover down until it completely connects with the chassis.
b. Slide the cover forward.
c. Attach the screws to the back side of the case.
TS-1635AX User Guide
Installation and Configuration 22