How to make tax declaration?

Ok just looking for some advice.

Basically, I was never sent my tax declaration forms. I've been living, working and paying tax in Brussels since 2011. When I contacted the ministry for finance, I was spoken to by an extremely rude woman (how surprising) who informed me that my registration was not completed until 2012, and that's why I wasn't sent my tax declaration.

I was told to order it from the website. However, I can't seem to figure it out. My French is ok but not great. I believe this is the correct page, http://minfin.fgov.be/portail2/fr/themes/declaration/doormat-2012.htm but I'm unsure of what exactly I need to do. The authorities are less than helpful, the commune laughed at me over the phone when I asked for information on the tax declaration. Do I simply need to fill in this document (http://minfin.fgov.be/portail2/downloads/declaration/2012-partie-1-decla...) and return it?

They're making it so difficult that I would normally give up, but I'm owed quite a bit of tax back so it's worth my while to comply.

Thanks in advance.
Danny.