Snakers,
Very sorry for the delay in getting back to this. There's no automatic methods for adding the Like button to Kunena posts. However, you can easily create a JFBCLike module instance and assign it to your Kunena menu items. Alternatively, you could add the {JFBCLike} text to your Kunena template files to specifically target wherever you want the Like button to appear.
If you're looking to add a Like button to each individual post though, there is no way. Facebook only allows Like's on a per-URL basis. There is not a unique URL for each Kunena post, so even if you added a Like button for each post, the Like would be for the current thread, not the individual post.
Hope that makes sense, but if you have any other questions, just let us know.
Thanks,
Alex