Hardware Installation
From the frount look at the left hand side and remove side pannel.
This will expose the internals ware you should normally have spare slots.
Make sure your computer is turned off at the power supply the the back or unplug it.
Remove or Push out your blank add-in slot, you may wish to clean with compressed air or 99.9% Isopropanol the add in card slot due to dust buildup.
Use a standard M3 screw on the bracket to secure the card in-place inside the system, place pannel back on and power on the system.
PCIe cards are PCIe 1x in size and one case slot in size.
Due to the low power requirements the power passthough should be enough if not please add an ATX or 12v power supply to your setup.
You can make this into an full PCIe slot with 1x bandwith.
Mini PCIe/Msata to PCIe + Power
You can make this into an full PCIe 16x slot with 4x bandwith.