Help needed in customising Brian’s Threaded Comments

I wanted to use this plugin on my site but I have no idea how to edit briansthreadedcomments.common.php to fit into current comments style.

This is the given file

http://liberta.espoireve.com/1.txt

this is my comments.php

http://liberta.espoireve.com/comments.txt

this is the sample comments.php given in the plugin

http://liberta.espoireve.com/commentsample.txt

Could anyone point me in the right direction?

Thank you 🙂