To be certain, I recommend:
* Consulting your owner's manual: This is the best resource for the precise location.
* Looking for a small reservoir with a cap: Systematically check the driver's side of the engine bay; it's unlikely to be anywhere else.
* Checking online resources: Search for "1998 Oldsmobile Intrigue power steering fluid reservoir location" along with images. You might find a picture matching your car's engine bay.
Remember to be careful when working near hot engine components.