EDIT 11/19/09: I'm pretty sure I figured it out last night.

Hi!!
I'm not sure if anyone that sees this can help, but how do you convert an image from RGB to CMYK? I've looked around online but I don't really understand what to do and I don't want to download random things that don't work. Plus, I'm working from a Mac, but it is possible to get it onto a Windows Vista computer. I would prefer to do it on my Mac and, if possible, for free.

I have Photoshop Elements 4.0 and Corel Paintshop Pro 10.

I kind of understand what CMYK is though. It's, like, kind of the same colors as RGB but sort of different....I guess...maybe....I dunno anymore...>,<

If anyone can help, it would be awesome!