Well, we found the passenger floor pan was repaired and the previous owner didn't replace the frame rail. The part of the frame rail that connects to the main frame is still there but useless.

Is it an urgent matter to address Before we drive it?

Pics sure would help answer stuff!

Yes, pictures would be pretty important.

It could be extremely urgent, or not very, it all depends what you mean by "connects but useless"

Consider that your tension/compression rods attach to the end of those stubby little frame rails, they position the front wheels fore & aft and if one gives way you might find yourself suddenly veering into a ditch or oncoming traffic.