publicise facebook connect

Hello,

I have some issues with connecting Facebook with my website.

– In Settings-Sharing, when I click to connect Facebook, it doesn’t work.
It says : click on Connect then You can connect your site to one of your social network profiles by following these steps:
Go to Settings → Sharing in your dashboard;
Click on “Connect” next to the Social Network you want to connect to;
Log in to that Social Network site and authorize the connection.

So when clicking on connect, we ended up on a blank page. Same for the other media links.

Thanks for your help.
D.