Add footer link through theme functions.php

// Add Footer Link
function wpregular_footerlink()
{
    if((is_home()) || (is_front_page()))
    {
    ?>
        <div id="footerlinkwpregular" style="text-align:center;"><p><a href="https://wpregular.com" target="_blank" style="font-size:10px;">WPRegular</a></p></div>

        <?php
    }
}
add_action("wp_footer", "wpregular_footerlink");