Assuming the only reason you want to do this is to post to APUG galleries otherwise I wouldn't answer
If your scanner has the ability to scan negs, the only real differences to scanning prints is the input setting (you need to pick what you're scanning, usually has options like Colour Positive, Colour Negative, B&W Negative, LineArt, Document, etc) and change the scan resolution to something suitable (higher for film, usually the native max of the scanner.. check the specs). Once you have it into PS, the usuall applies to get a file suitable for uploading.
There was a little debate about doing this in one thread, but since I do it I don't mind. You might want to get an opinion on something before heading to the darkroom.