Well, welcome to DeeZire forum.
As I see you seached smth. by key word
Propaganda
As you wrote [Propaganda] is a weapon.
You may put it in rules(md).ini in any place you want. Don't forget to add Damage=XX (XX - any number) to this code. Then select any unit you want and give him this weapon by such code Primary=Propaganda or Secondary=Propaganda.
You should read some tutorials about rules.ini and rulesmd.ini files (how to use them) and on editing wepons.
I think you can find such tutorials yourself in any searching sait, for example
http://www.google.com