You managed to log in at last Pierce
I haven't done this (car too old) but there is a filling kit and as far as I am aware you split the feed pipe at a junction near the reservoir and attach the filling kit to that.
Some reservoirs are clear but I believe the more recent ones are black, in which case I think the trick seems to be to keep filling until no more goes in.
In any case, someone who knows what they are talking about will be along sooner or later with precise instructions.
