Welcome. The hood release is is on the underside of the frame along the right side of the hood near the front. Crouch down and you'll see it. Pull it down (spring loaded) while lifting upwards ppb the hood. Once open, you'll note that the lower side panels still in place can be removed for better access. The tractor identification badge should be along the right side of the frame as well.
As Wagtail noted, and I would agree, that tractor has probably been neglected and a full change of fluids and filters, as well as every thing else listed in the maintenance section of the manual will only work towards your benefit. Could be anything as serious as a failing fuel pump to something as simple as debris in the fuel tank itself prohibiting flow. That's quite a few hours do anything odd possible. Luckily your friend's husband will probably nail it down pretty quickly.
Best of luck!
