I have tried to update concrete5 through Simple Scripts which messed up my sight. I than had to restore it through a backup I done.

Now I am trying to update Concrete5 through the dashboard and I get the following message:

"Unable to write to config/site.php. You must make config/site.php writable in order to upgrade in this manner."

So my question is, how do I make congig/site.php writable so I can update?

Thanks you for your help.