I saw the screenshot you attached. To change the color of the menu in the topbar you need to add the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.
.whb-top-bar .whb-secondary-menu .item-level-0 > a {
color: red;
}
I saw the screenshot you attached. Please Replace the previous CSS with the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.