Can't change colors of header & no responsive version

Hello. My woodmart template does not work properly. I’ve watched videos with changes of headers, but it doesn’t work in my version. When I try to change color, the icons of cart, wishlist, search icon, etc disappear and simple squares appear in their place. What is more, when I make a mobile version, nothing changes on my phone. The settings are done at cockpit, but they do not appear on phone. I also can’t get rid of “wood mart” logo on mobile version.