I am new to wordpress,I have a wordpress site using bigtech theme, I have to update its bottom most section containing copyright, privacy policy and terms and condition. I couldn’t find an interface to update it through wordpress dashboard. Where should I go to edit the footer?

I have tried editing through theme file editor
Theme File Editor section Appearances shows only two line codes
do_action(‘bigtech_footer_style’);
wp_footer();
Customize section under Appearances also contain no option to edit footer