Gearbox oil topup

Hey guys car is a 16v 6n recently the box has started to whine a bit when you come of the gas, it drives fine and pulls well so my first point of call is to see if it runing low on oil, easy job right? Well I just attempted it with a Haynes and the pictures are so unclear it and I don't want to go and undo the wrong nut.

Can anyone point me in the right direction As to where I have to top it up.

I was just think I may have to take the wheel of to get a better look am I right?

Thanks !!