just change the youraccount to your username and redirect it out by editing the html
<! DOCTYPE html>
<html>
<head>
<base href="https://gfy.com/" /><!--[if IE]></base><![endif]-->
<script type="text/javascript">
if (location.host == youraccount.tumblr.com')
location.replace(location.href.replace(youraccount .tumblr.com', 'xrateduniversity.com' ));
</script>
</head>
<body>
<a href="https://xrateduniversity.com">NEW URL: OLDURL is now NEWURL</a>
</body>
</html>