Not sure if you did this… but I removed it by going to my index.php page (via ftp) and removing the script that I inserted when I installed the plugin.
It will look similar to this:
<script src="https://static.dudamobile.com/DM_redirect.js" type="text/javascript"></script>
<script type="text/javascript">DM_redirect("https://mobile.dudamobile.com/site/jacobsride");</script>