XPS 8900 How to Install a BluRay Burner & Additional Internal HDD

I have not been able to find out how to install a Blu-ray Burner into this XPS 8900. I have an LG that I had in my HP that I replaced with this Dell. I can not find any documentation on how to do this on the Dell XPS 8900.

I opened the case as it was easy on my HP and this thing has a cage all around it to even access the HD.

I would also like to add in an additional HDD to the unit but I don't see anywhere how to do this.. or to take the cage apart inside.

Please help me find documents on how to do this.

Keith