I assume that you have space in your computer tower to fit it?
It will have to be held in place by srews similar to your CD-rom. A power supply will have to be connected to it the same as your CD-rom. A Data cable will also have to be connected and may come from a spare connector on your CD-Rom data cable. Your new DVD writer will have to be changed to slave or better to make your CD-Rom slave and your DVD master in which case you will have to connect the DVD on the CD connector and connect your CD on the spare one, all assuming you have one. for more details other members will nead more details about your computer. Pamy