Zafira gearbox oil change.?

HI guys

I have a 2.2 Zafira and the gearbox oil needs a change. I can't find the drain or filling whole any tips?

And can I use Castrol Syntrax?

Cheers

Matt

what gearbox model should I have in My Car? 2002 2.2 ltr and 5 sp Manual?