Hello, @naijapropertyhub,
Unfortunately, there is no option in the theme to change the color of it. You have to do it with the CSS code. I see that you already tried it with the Custom CSS code but the code you added was wrong.
Please copy and paste the below-given code to the XStore >> Theme Options >> Theme Custom CSS >> Global Custom CSS.
.content-product .price{color:#aa004f !important;}
Then save settings and check back to your site after clearing the browser cache.
Note: In the above code the HexaCode “#aa004f” is the color you can change it as per your requirements.
Regards 8Themes Team.