how do i use my newsletter form code with pop over plugin?

hi,
i tried using the pop over plugin to show up a subscribe form to my newsletter, but it shows up blank.
this is the code
<script type='text/javascript' src='//p.ravpage.co.il/00843a70291d6bf26f5b96e9a31c98dc52CEC062' charset='UTF-8'></script>

thanks!