1) Install via OpenCart Extension -> Installer
2) On frontend website footer, it will hide the extras section from footer and will adjust the width of footer

Note: This extension works only with opencart default theme, if you have a different theme. Please replace this line with your theme common/footer file code <h5><?php echo $text_extra; ?></h5> with your theme code. Also check for footer section div div class="col-sm-3"> if its custom theme it need to be relevant with your.