I am unable to see my website on Facebook Fanpage - URGENT

I am unable to see my website on Facebook Fanpage - URGENT

I have searched a lot over the internet but no success. So the problem I
have is I have added the website to facebook fanpage Tab but when I go to
facebook fanpage and click on the tab the page shown is blank. Here is the
facebook fanpage website tab link -
https://www.facebook.com/drdulitskymethod/app_640172482681632 (this is
blank). So can anyone please help me in resolving this issue. I need to
get this done as soon as possible.
Thanks