Hello,

For the general color changes under the Theme, you need to go to the same Theme Settings > Styles and colors > under that click on Colors > there you can find general Colors to define which are Primary, Secondary and Link Colors: https://snipboard.io/c3l2RB.jpg

Secondly, if you are referring to Theme Settings not working on your Site then please try to disable mod_security on your server. It seems to block Theme Settings “save” requests. Contact your Hosting Provider for help.

Best Regards