Could you go have a look at the RAIDR subforum. There is a very good guide that will show you what you need to do to get it to work for you. Once you have a read it will all be quite simple.
If you do have any issues after reading the install guide (OS that is) please do post up and we will help with pleasure.
To help us help you - please provide as much information about your system and the problem as possible.