jetforce oil change

I've recently bought a 2006 Peugeot Jet Force C tech 50 for my son and am currently tidying it up and ditching some of the useless bling it has acquired over the years.
I'm wanting to give it an oil change, but no matter how hard I look or search on the internet cannot find a
way to change the oil or put new oil in!
Any advice would be very gratefully received.

 

On a fair few of the pugs you just top up the gearoil and cant change it.
Tried changing the air filter yet? Good luck....