Units

[PussEKatt]

I asked this on the CIV 4 forum and got 60 views but no answers,hopefully I will get an answer here ?!
If I download a unit how do I get it into the game ?
What I mean is.I didnt mod the unit,someone else did that I just downloaded the unit and I want to put it into the game,how do I do that ?

[PussEKatt]

There are a lot of units out there made by people that put in a lot of work to make them,so why are there no instructions on how to instal these units ?!