I have a logo I'm working with that I want to change one of the colors. The blue color I want to change to is almost a neon blue. When I go to select this color, I see a "gamut warning" printing error/warning. That's fine, but this isn't for print. It is for my website. What do I need to do to this PSD file to be able to change colors as I please. It is CMYK at the moment. Thanks.
Well you should use RGB for web, but you can still have colours that are not safe for web. I don't do websites, but if you use Save For Web, I imagine that will remove unsafe colours. But definitely change from CMYK to RGB as a starting point.