Put a GameObject in the script's inspector when the script belongs to a prefab

hey,

I'm making a script for a prefab, this script has a public GameObject but the problem is that the script belongs to a prefab which will be add in the scene during the game.

I can't manage to add the public GameObject in the inspector because the GameObject is in the scene. So I made a prefab of this GameObject but the script doesn't recognise the GameObject in the scene...

Do you guys have any idea ? Tell me if you didn't understood my problem.