Theme customizer not applying to all pages

I got the Madang theme with support via themeforest on 21 Feb 2021 (1) I’m unable to edit the text color or font size within the theme, even after updating the customizer. weblink is: | specifically, the subtext color / text on this page psd: View$ (2) If I wanted to use a WPform rather than contact form in the theme, how do I get it aligned? or how do i change the mouse over color from green to my brand colour? Appreciate your help.