在模版functions.php文件中添加如下代码:

function insertFootNote($content) {
if(!is_feed() && !is_home()) {
$content.= "<div class='sublast'>";
$content.= "<p>如有问题请联系站长QQ:78025108 <a target='_blank' href='//shang.qq.com/wpa/qunwpa?idkey=06bc535431addacecaabcb4f4a524deb0fdbcf23277c993f01d64a937663f65b'>QQ群:253510359</a></p>";
$content.= "</div>";
}
return $content;
}
add_filter ('the_content', 'insertFootNote');

在模版style.css中添加如下代码:

.sublast{
width:100%;
height:40px;
line-height:40px;
background:#eee;
text-align:center;
font-size:20px;
color:red;
}
.sublast a:link{
color:red;
}