Not the best pictures but if you look at these and then under your car it should be obvious.
What I found was:
.Undo the fill cap before the drain one because it can be a bit stiff and you don't want an empty gearbox you can't refill.
.Don't lose the washer in the oil you've drained out
.Stop filling when it starts to dribble out of the fill hole (the top hole)
.It should take about 2.4L
.Tighten them back up to about 23LB/F (I just did it quite tight with a smallish bar) as long as you don't go mental it'll be fine.
.You'll need a long funnel and the tool I mentioned a few posts above.