Change font colour

Look for this css rule in your theme’s style.css:

body, .entry-content {
    color: #53565a;
}

Change 53565a to whatever color you like.

For example for black color it would be like so:

body, .entry-content {
    color: #000000;
}

Consider creating a child theme otherwise all your customization will be overwritten when you next update your theme.

Alternately:
– If your theme has a custom CSS option, use that to add the CSS.
– If you are using WordPress 4.7+, use the “Additional CSS” option in the customizer.
– If not, install the plugin Simple Custom CSS