Sol: Please see my below sample to replace the text between the anchor element, and it worked for me:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<center><a href="http://somee.com">Web hosting by Somee.com</a></center>
</div>
<script lang="javascript">
document.body.innerHTML = document.body.innerHTML.replace('Web hosting by Somee.com', '')
</script>
</form>
</body>
</html>
suggestion: My suggestion is either you take a paid hosting where this kind of a message is not display or leave the message as it is (as per his terms and conditions).