XSARA PICASSO HDI 2.0 90 CV air filter

Hello.

Can anyone help me? I want to change the air filter in my picasso and I do not know where it is and if it is accessible or you have to change a lot of things ... the issue is that I have not passed the ITV by gases and I am with which I have given him a few laps up revolutions, I have put Wynns injector cleaner and, to finish off, I wanted to change the air filter ...

please, help !!!