Before ever opening the case and dealing with the internal components of a computer ALWAYS unplug the power. After you pull the cord, wait 30sec for the capacitors to discharge before making contact with anything inside the case. It is also a good idea to touch the metal screws on the back of the case to ground yourself so you avoid zapping anything with a static shock.
Step 2: Remove the Drive Cover
In the front of your case, find an opening for the drive to go in and remove the plastic cover from the case. Some cases, like mine, have a metal backing that also needs to be removed. This is easily removed just by twisting it a few times and it will break off.
Step 3: Mount the Drive
Insert the drive into the Computer. Some computers like mine require rails for the drive to be inserted. Most cases will just require you to insert the drive and then use the included screws to secure it in place. You will want to make sure that the drive face is flush to the front of the case to avoid doors not shutting and a poor looking install in general.
Step 4: Connect the Data Cables
Locate the smaller width cable that came with the drive. You will find that each end of the cable is keyed with an L shape. There is a plug on the back of the Blu-Ray drive that matches it so you cannot plug the cable in incorrectly. Attach it to the drive. Next locate the SATA connector plug on the motherboard. Most motherboard companies have the connectors colored bright yellow, but it is not standard, so yours may be different. Plug the other end of the cable into an open SATA connector on the motherboard.