The I position is the first position on the stalk. You turn it to turn on the wiper on the intermittent speed. I turn it on "I" and then turn the ignition off quickly and the wiper arm will be the upright position which is a good place to start pouring on the fluid.
Just pull the bottom out the cover out towards you, it will just clip off just above the clam shell shaped hub which houses the transmission gears of the blade.
Good luck with it, hope it works well for you.