Meta Tags - How to make facebook show the correct image?

I need to get facebook to show a picture and some meta-information whenever i post the link to my forum: http://finnvegg.no/
I found this guide, but i have no idea where to put the codes: AddThis button: How to make facebook show the correct image and text for a blog post
Please advice.
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Best Answer
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bh8vn ✭
Just replace the new folder, go to Addthis link in your dashboard and config your images field, all done
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Answers
Hi friend, if you want to share a discussion on facebook, may you will like Addthis plugins: http://vanillaforums.org/addon/addthis-plugin-1.2
version 1.2 with images field, you just add your image url then the plugins will do this for you.
Cheer
yeah, i already added that plugin...
where is the images field?
Do use use the lastest version, I have just updated it few hours ago
I'm using 1.1 right now, but whenever i try to click "disable" before i update, nothing happens?
yeah, i can't disable "AddThis", the "disable" button does nothing.
Just replace the new folder, go to Addthis link in your dashboard and config your images field, all done
Brilliant!
I'll do that once the error-message i get when i try to enable Version 1.2 has been resolved.