In the manual it says that you can upgrade your prefabs by clicking apply on an instance. All I get are “select” “reverb” and “open”. Where is the apply button on the instance?
…reverb? What buttons are you looking at?
Anyway, you want Apply Changes in the GameObject menu.
That option is grayed out for prefabs with childs.
I got this one 
I aint good for much, but hey.
Only Prefabs selected in the Scene view or Heirarchy have these buttons - because they are instances of the Prefab.
Changes made to the Prefab in the Assets folder are are automatically “applied,” and likewise would have nothing to “revert” to. I hope this helps.
It sounds like it’s not really a prefab.
It sounds like it is actually a model.
This is discussed here:
http://answers.unity3d.com/questions/12238/why-cant-i-see-the-prefab-select-revert-and-apply.html
So, there’s no .prefab that it corresponds to. It might be a .OBJ, .FBX, etc.
When you click Open, it might try to open it in something like 3d Studio or Blender.
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Yep, that was it. I thought the .OBJ was the prefab. Thanks a lot!