Dahua DH-XVR5104HS-4KL-I3 User Manual page 19

Place the bracket to the device and then fasten the screws on the sides of the bracket.
Connect the HDD data cable and power cable to the device.
Put back the cover and fasten the screws on the rear panel to complete the installation.
Install other HDDs
Fasten screws
Connect cables
Put back cover
10
User's Manual