Open up NWN. Instead of hitting the button that says "Play" hit the button that says "Toolset"
Then you want to create a new module. It will ask you what tileset you want to use. Then it will ask you what size. You make your adjustments there.
Then, once you open up your module, click on edit and there should be a dropdown menu. Select Module Properties
This will open up a new window. Click on the tab that says Custom Content.
There should be a big open window with nothing in it, and below it there is a drop down list. You select your haks from that list and add them by clicking on the add button once you've selected it. Make sure you put these in the order that was listed on the previous thread. They should already be in the correct order on your list, though, so start at the top and add them one at a time from top down.
After you've added in all of the layo haks, you will click ok, and it will tell you that you are about to change your module, yada yada... say ok. it will asses the module and apply the haks. it will tell you that everything is fine, and then you'll simply have to reopen the area either by clicking on the "go to starting location" button or by double clicking on the Area001 (should be blue)
then you can start building your module and you should have the options available that are given by the haks.