Okay, from the lack of a sticky for this and not seeing it in the FAQ, I'm either overlooking something or I'm have a stupid moment.

But I don't see where to do the add-ons in the process of running nlite. Can someone help me out here?

There is a sticky thread called: "Complete Beginners Guide to nLite Unattended CD's" and here

There you will find a video guide exactly answering your question.
Hope this helps

Excuse me while I go hide in shame for my ineptness at finding the answer.. I actually looked at that guide but missed the answer apparently.

Thank you for your assistance.

Hahaha, now that's funny

See the "hotfixes" tab in nLite? Go there and integrate everything you need
On the two links above you can actually watch a video tutorial how to accomplish this task.

The video tutorial is called --> HowTo: Integrate addons with nLite
Find it?