The module itself is integrated to only the servers that are running the game itself.
But you can play after making a subscription of a biography of a character of your choice
Firstly you need a legitimate copy of Neverwinter Nights, and it's 2 add-ons (Shadows of Undrentide & Hordes of the Underdark).
These can be most easiest found in the Neverwinter Nights Platinum Edition, which costs only so little in real world currency from a webshop
I recommend reading from [LORE]http://lore.layonara.com/StartHere[/LORE]
And then posting a biography on the forums, in the appropriate Character Submissions part of the forums.
There is a nice widget for you to use that will automatically format the biography subscription for ease of access. (Character Submission Wizard)
You will also need to download and unpack the hak's associated with Layonara, they can be found from
http://forums.layonara.com/local_links.phpThe hak's go into your nwnroot/hak directory, which might be like so in it's path C:\\Bioware\\NWN\\hak or somesuch, basically the folder where you installed the game is the right "nwnroot".