Hello @Mlroun25,
Thank you so much for using our theme Gist and thank you for using the support forum for the query. For the color option, we have added features on the premium version. If you want to do it on the free version, please send us your site URL here so that we can provide the custom CSS to change the color. Otherwise, let us know which child theme are you using so that we can give you the custom CSS code as well.
Thank you
Candid Themes