Techno challenged individual = ME!

I'm technogically challenged. I know that. I accept that. That has been established. My problem is that my computer monitor currently has a blue hue and I don't know how to make it go away. No doubt I'm responsible for pressing some button I shouldn't have, but for the life of me, I can't figure out how to make my screen a "normal" color again. Why do these stupid things have to happen when my husband is away on a trip?