Unfortunately you can't do this with Video Studio 8. The software comes with a cut down version of DVD Movie Factory. However you can edit DVD RW disks using the full version of Movie Factory. You could always try the trial from Uleads website.

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IBM A51p with 160Gb Boot Disk, 160Gb external Firewire Disk, 2Gb Memory and a super duper sound card, 17\" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
ULead products mostly including Mediastudio Pro (V8.0), Video Studio 8, Movie Factory 2.0, Premiere Elements

Remember, there is always more to learn than there is to teach.