If you don’t have an access hole on your car for the refill plug then make one yourself! I think someone ( probably DaveW) has detailed doing such a job.
Whatever you do, check you can use the refill hole BEFORE draining! It may be possible to refill from below if you can raise the car enough by using a tube from the refill bottle. More fiddly but do-able. I think most servicing garages tend to do it that way. To save moving the leather on the transmission tunnel ( not difficult but an extra faff).
