Locate both the filler and drain plugs. Using your 17mm hex driver, first loosen the filler plug. Then loosen the drain. With the car level on the ground, remove the drain plug and dump the old juice. You can jack the front of the car up a bit to encourage the oil in the forward part of the trans to slide back towards the diff. Once it is finished draining, put the plug back in.
Now raise the left side as high as you can go and remove the left tire. Open the filler and pour in precisely 2.5 liters. The commonly available oil bottles have a tapered end on them. I use a piece of 3/8 in hose and force it over the tapered end. Then stick this into the filler hole and squeeze the contents of the bottle out.