i mean where do i put a mode in when a have downlode it?😎 ?

As in a game "modification"?

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Depends on what the mod file is.
BIG - goes directly into GeneralsZeroHour folder NOT DATA!
Folder (INI or english) - Into GeneralsZeroHour\Data YES DATA!
exe - install it
A map - My Documents\GeneralsZeroHourMaps\maps(unoffical)

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after downloading real thrat mod, what do i do? what folder to put it in?

Since the Real Threat mod is for Command and Conquer Generals, you would typically install it into the following directory: C:\Program Files\EA Games\Command and Conquer Generals.

EDIT: For the Zero Hour version of the mod, install it to here: C:\Program Files\EA Games\Command & Conquer Generals Zero Hour