ok first off its PROCEDURE
second, make sure that the hard drive you took out of your old computer is compatible with your new one. find out if its a SATA or this one other cable, the other cable would be wide and the SATA would be skinny... ya youll figure it out. there should be another cable hanging out from the cable thats already connected to your current hard drive, connect that to the new hard drive youre putting in, and then follow the set up instruction on the monitor