Well, the link I gave you brings you to a tutorial that is pretty simple, but ok.
First, you have to create a folder for your Mod (if it's not already done). Your Mod's folder structure should contain the following folders:
- "Text", containing at least two files: Civilopedia.txt and PediaIcons.txt
- "Art", containing various folders such as "Advisors", "Cities", "Units", "Flics", etc.
Now if you download Ho Chi Minh, you'll get one download for the Flics (put them directly in Your Mod\Art\Flics folder) and one for the pcx files. The file you get is called "hochipcx.zip". Unzip it and you'll get a "hochipcx" folder. Open and you'll see 3 folders: copy them and paste them in your Mod's Art folder.
You will then have to open and edit PediaIcons.txt and Civilopedia.txt files: copy the lines corresponding to an other Leaderhead and mofiy them so they correspond to the files you just added to your Art folder (it's a bit tedious to detail everything there, but look how it works, it's quite simple. You just have to follow the example of an other LH).
Finally open the Editor, go to the "Civilizations" tab, look for "Animations" (left-down corner) and add the flics corresponding to each era (generally XX_a1 is era 1, XX_b1 is era two, etc.)
Try exploring things by yourself, we have all been there and after a while it gets very easy to understand. The thing is if you forget one step the game will look for a file that isn't there and will crash. No big deal, a message will pop-up telling you what's wrong. You will then have to correct the path to the missing file and/or make sure the file is there and correctly spelled.
Hope it helps.