Gonstruct Macport

[Ekflight]

My problem is that I can't edit the sources.conf file...
It says I don't have the rights to edit it.
Even after I set the properties of the file to allow the Administrator to set the file's content, it still doesn't allow me... If someone knows how to fix it

Ps: I was logged the whole time on my admin account so that's why I don't see how to fix it...