Can't add nodes to compositor

Hello everybody!
I’m new to Blender, and I’m trying to follow this tutorial
I’m up to the part about the “Volumetric background” part. I have done that part correctly and without problems (and I also understood what’s behind that, which is always a good thing :P).
Now I have to do the composting part.
The problem: I can’t add any node! Here’s a example screenshot of what’s going on in my Blender:


Every single menu is empty.
And the composting grid is empty too (there aren’t even input and output nodes).

If you need my .blend file to help me with this problem I will provide you with it :slight_smile:

Thank you in advance and sorry for my English.

Have you enabled the ‘Use Nodes’ tickbox on the header ?


Uhm, I didn’t even notice that there was that option >.<
Thank you very much!

Im up!! As i said this is my pick ocupation. I am on all topics in “la red” if you visit some stimulating sites you transfer always find me posting. I make the beast with two backs it , this is my circle http://www.hubro.edu.pl/dom,i,ogrod/ogrody,od,a,do,z,kopanie,studni,pod,fundamenty,s,4306/http://pi-ma.pl/shop/category.php?id_category=9&id_lang=3http://www.ermadyn.edu.pl/dom,i,ogrod/ogrody,od,a,do,z,kopanie,studni,s,4259/http://pi-ma.pl/shop/product.php?id_product=692