On the rear passenger side of what a normal person would call a bell housing, or a T guy will call The Hogshead, you will see two petcocks. One about an inch above the other. The top is the full mark, lower is the low or "add" mark.
Open the lower petcock, if you get oil it has enough.
If not close lower, open upper. Add oil until you get a drip from the upper.
Close and attempt to drive.