Quick solution:
Go to Dashboard -> Appearance -> Editor -> style.css should be the default, if not, select it from the right side -> Find “#respond” -> Add “display: none;”. For example:
#respond {
background: url(“images/dash.png”) repeat-x scroll 0 0 transparent;
margin-top: 10px;
padding-top: 20px;
display: none;
}
Or remove <?php comments_template(); ?> in index.php, single.php, and page.php.