Hi, I have a free salon pass but can not figure out how to use it. When in the salon, there does not appear to be a way to consume it. Any pointers?

Also, I would like to change a costumes color... I see you need a Color Change Pass... How do I get one?

Thanks

You consume the Salon Pass after you make changes (specifically changes with the SG icon next to them) in the Salon when you choose to exit.

Color Change passes can be obtained from the Swap Shop by trading in items obtained from the AC Scratch.