You do not need to insert any code you just need copy the facebook url you want to embed, you can see an example on this page.
We have a special article if you are having some issues finding the correct facebook url.
If you present a problem with this or any other plugin I recommend creating a new thread on the support forum, that way you contribute in a positive way to the community, giving a 1 star review just because, will give you bad karma. ??