[Solved] Where to put the Facebook page plugin code

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Hi, my site its topartigos.pt and i have on the site a subpage called "Página de Facebook" (at the bottom of the page) and i wanted to put the Facebook Page Plugin code inside that subpage but i dont know whats the name of the file to put it.
Anyone knows whats the name of the file and where is it, to put the code?
I am using Royal theme version 1.3.5.

Thanks.

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Answer: no one said me how to do it so i found it my self

The thing that i did was going to: https://developers.facebook.com/docs/plugins/page-plugin
Then i copied the code of my facebook page and then i went to osclass ( oc-admin ) and i went to pages, selected the page that i wanted and then i went to src tool and i paste the code.

Now its working as you can see:  http://topartigos.pt/index.php?page=page&id=26