The fill plug is on the rear-passenger side of the transmission and may be a little tricky to get to.
Are you having any issues or noticing any leaks from the transmission? If not, then there really is no reason to check or add fluid.
Your owners manual lists the spec and quantity for the oil.
Yup, the drain and fill plugs are on the passenger side of the trans
. The manual only gives you a Ford number for the type of fluid, but a buddy of mine is a Ford tech and he pulled up the Ford fluid spec site/resource and showed that number equalling 75W-90 gear oil. Pretty sure the amount is 2.8 qts., but I think it might be like differentials, fill until it runs out the fill hole, the manual does have the exact spec for the amount though.