I cannot change the color of the browser in the settings, there is the option but I did not change it, I already did it with code but it does not change nor can I add a banner in the header. There are errors that need to be fixed.
To assist you in the best possible manner, I kindly ask that you please provide me temporary wp-admin info (wp-admin URL, username, password) and screenshots that illustrate the problem to the Private Content area, this will allow me to thoroughly investigate and address your concerns more efficiently.