I see. So if I have the Goty?
FO3 GotY on which gaming platform? PC, XBox 360, or PS3?
On PC, you have to install them from the second disc after installing the main game from the first disc, and then enable the active status of the DLC in the data files section of the FO3 Launcher.
On the consoles, I think they are automatically activated once the game is installed.
Jenifur Charne