Hi, and welcome to TiberiumWeb!
Judgng by the question, you are obviously new to modding, so I will point you in the right direction:
First check
THIS out. It explains virtually everything you need to do some basic editing. As you will see in the example, the "tags" are set out in a way that lets them explain themselves - you are after the tag "Name=". All the tools mentioned in the tutorial,including the one for extracting rules.ini can be found
HERE.
There are actually two other ways - one is through maps, and the other is through LangRule.ini. The first method I mentioned is by far the easiest though, and I suggest you get familiar with that method first.

Fluent in |3375p3k, 68 65 78 65 64 65 63 69 6d 61 6c, ebg13, -- --- .-. ... . -.-. --- -.. . --..-- and 01100010 01101001 01101110 01100001 01110010 0111100100101110
(Whoever translates that gets nothing, just +1 on thier geek score)