Hello and sorry for my bad english!

I bought the game and it was installed in spanish language, but the files with the unit´s description are vanished .
Ok, i download the Epistolary Richard´s files but i have a little trouble with de modifications:

Could somebody say me how i can add units?

For instance: i want to recruit highlanders for the spanish crown.

Thanks a lot and i repeat, sorry for my bad grammar.

Bye