The tufat.com (the creator) has a great walk through. If you download the latest version of the flashchat software it includes the intigration built in, you just need to change 2 lines in one file and then upload the software. Its really easy but it does seem to have a problem with at least 6.5.1 where it will not auto login users, but other than that it works great.
Here is the link to the integration kit:
http://www.tufat.com/resources.php?dl=119
