Hello @ahejlik,

To change the link color and the scroll to top color you will need to go to your Admin Dashboard > Appearance > Customize > Theme Options > Advanced Options > Custom CSS field and paste in the following custom CSS :

a, a:visited {

Color:#07b37e; 

}

.scrollup i {
    color: #07b37e;

}

You can replace the color hex code of your desired color in the Custom CSS.

You can also upgrade to pro version of the theme that already comes with color options you are looking for along with many amazing features. To know more about this and other features of the Onefold Pro theme please see this link : http://themepalace.com/downloads/onefold-pro/

Hope this helps,

Best Regards !!