Merging CodeIgniter and NoNonsense Forum

I'm using CodeIgniter, and would like to offer users a simple forum to discuss their business. For example the (1) Leader/Director of a company may want to discuss internal business with the (2) Manager, and the (3) Foreperson, and the (4) Workers/Salespersons, and where all other users of the website would be denied access, and I thought NoNonsense Forum (NNF) would be ideal. http://camendesign.com/code/nononsense_forum

I have downloaded the Zip folder, unzipped and read the text files particularly INSTALL.txt but I'm confused on how I would get it to work. I note that the .htaccess file is necessary for NNF to work, and the same named file is also necessary for CodeIgiter to work. That file is located in C:\xampp\htdocs\application\.htaccess and the contents of that file are as follows;

PHP Code:

<IfModule authz_core_module>
Require all denied
</IfModule>
<IfModule !authz_core_module>
Deny from all
</IfModule>` 


I thought the appropriate place to paste the "contents" of NNF folder would be C:\xampp\htdocs\application\ but the two .htaccess files would conflict, however I thought there maybe a possibility they could be amalgamated.

I already have placed the folder in C:\xampp\htdocs\application\NoNonsenseForum-master

I have created a "view" page such as C:\xampp\htdocs\application\views\world\johndoesalesforum.php

Having said all of that I have no idea on how to implement NNF into CodeIgiter and get it to work.

Can anybody please guide me?