To change the footer content of the Directory Starter, Whoop or Supreme Directory theme, use the following PHP code, and adjust as required.

add_action('after_setup_theme', '_my_sd_footer_changes',15); 
function _my_sd_footer_changes(){
    remove_action( 'dt_footer_copyright', 'dt_footer_copyright_default', 10 );
    remove_action( 'dt_footer_copyright', 'sd_footer_copyright_default', 10 );
    remove_action( 'dt_footer_copyright', 'whoop_copyright_text', 10 );
    add_action( 'dt_footer_copyright', '_my_custom_footer_copyright_text', 10 );
}

function _my_custom_footer_copyright_text(){
    echo '© 2020 AyeCode Ltd. All Rights Reserved.';
}