Administration, management and configuration of your site

I don’t know where is the correct forum of this post, but i guess this one is the best fix.

So, i’m trying to add a button (as configuration, statics, authors, and so on) into the private space, in fact i did, just adding a few lines on /ecrire/inc/boutons.php, it on version 1.9.2e.

A week ago i’ve upgraded to 2.0.9 and saw that the same file to copy my previews code but it’s totally different !. So i try to realize how to make it once again and surf on SVN repository, then i saw that there is a file on prive/navigation.xml and i found the definition of every button there, but my 2.0.9 version doesn’t have it !

So i’m a bit confuse about where to change, can someone help me ?