Hello.
Thanks for posting your question regarding changing the color of your Site Logo section. The colors can be changed through the default Color Selector in the Customizer. If you click on one of the colors, the section(s) that the color is assigned to will briefly flash, to make you aware of what will change.
If the change can not be made within the Color Selector, the only other option would be to create a child theme and manually modify the CSS for that child theme. Note: the guide linked for modifying the CSS instructs to enter the modified CSS into the CSS editor, however, you should add that code to the child theme in this case. The child theme is important so that your customizations are not overwritten when the (parent) theme has to be updated. Although this is an advanced topic, the instructions should guide you pretty well. However, actually coding/developing that theme may require some more advanced knowledge of CSS. I hope this helps though!
Sincerely,
Carlos D