Thanks so much for answer. Now i don’t know what is the problem but i got a problem. I tried this way what you said from Theme Settings > Typography > Advanced Typography. But I couldn’t do it.

The problem is before changing Menu Link’s colors, when I tried to change something on Theme Settings, website is changing from my “Beauty Content/Demo”. I wonder this, why is it doing like that? By the way, i didn’t install Child Theme, maybe because of it? Thank you so much for all answers again. I uploaded the screenshots like before/after. 🙂