the picture is easy go to - Admin > Settings > Main Settings > Page Settings > Custom head code

 Add This Code For Your Sites Image : 

<meta property="og:image" content="http://somedomain.com/YourImageFile.jpg"/>

Add This Code For Your Sites Description : 

<meta property="og:description" content="Add Your Description Here Player!" /> 

Facebook scrapes websites every 24 hours or something so even after adding this code it prob wont work for a day or so.

here are some others you may be interested in 

<meta property="og:title" content="Title" /> 

<meta property="og:url" content="url info" /> 

after replying i looked at your picture a little more closely and it looks ike you sharing your link from your site using a like button or something of that nature im not sure if these codes will work for that let me know how you go, i do know these codes work if you share your link on facebook directly by posting the link to your profile newfeed on facebook, it takes a second then loads the data. either way let me know how it works for ya.