You can control primary and secondary colors of the theme in Customize>Design Customize section.
The elements that Main accent color and Secondary accent color are buttons, icons, hover elements, title delimiter and some other KC shortcodes.
NOTE: KC shortcodes won't apply settings from 'Design customize' section, if they have colors other than primary or secondary. In this case, you should edit the shortcode and choose custom color from its 'Styling' tab.