Share button with Facebook API?

Question

Facebook

Hello! I have a custom Facebook picture. When you click on it, a popup should open (similar to VKontakte).
I tried to implement it through the Facebook API, but for some reason it didn’t work out (it says that redirect_uri is not in the application).
Please help me make such a button (link). The difficulty is that when the user clicks on it, the wall (i.e., the description field) should leave the dynamic content (i.e., different each time).

Answer 1

If it's to share, then something like this:
<a href="http://www.facebook.com/sharer.php?u=MY_URL&t=MY_TITLE&src=sp" target="_blank">Share to Facebook</a>

Answer 2

missed