does your rss.php work with pure phpBB 2.0.6 user ? or only for PostNuke + phpBB2.0.6 ...
...uhm.......no. You don't need phpNuke or PostNuke for this MOD to function. In fact, if you noticed, the person you quoted had to modify rss.php to work with phpNuke, because rss.php was not originally written for phpNuke. Also, in case you're confused, phpNuke and PostNuke are essentially the same thing.
Are you asking because you can't get the MOD to work with a stand-alone installation of phpBB 2.0.6?
Look, it's simple. Let's say your forum is at http://www.whatever.com/phpBB2
. You would put rss.php in the phpBB2 folder. If you're using "subSilver" as your theme, then you would put rss_body.tpl in phpBB2/templates/subSilver. If you're NOT using subSilver, then you would put rss_body.tpl in phpBB2/templates/<your template's name>. You only need to wory about the board's default template; the one that's used for Guest access.
Now, if you point a web browser to http://www.whatever.com/phpBB2/rss.php
, you should get an XML page. That means the feed is working. Now, all you have to do is point an aggregator at that URL, and *poof*, you're done.
Again, if you want a working example, look at http://www.sins.la/phpBB2/rss.php
This is RSS, and this is pretty much all RSS does. It's just an XML page. The rest of the work is up to whatever aggregator you choose to use. If you don't want to set a web server up to run carp, then I suggest you look at the first page of this topic, where there were some free personal aggregators mentioned for any major operating system.
I hope this helps. If you need any further assistance, please reply with your specific problem. If you're not at all familiar with RSS, how it works, or what it's used for, then this MOD may not be for you. You may want to look into Topics Anywhere instead.