Hello,
There is a "search" tool on MS Windows. Click on the "start" menu, and type "Allods" in the search box.
You'll have then some results, and you'll know where is your Allods Online folder

.
By default it's here : C:\MyGames\Allods Online EN\
Then you go to "Personal", find the Global.cfg file, and right click -> "Open with..." and choose notepad.
If you have Windows 8.x here is a tutorial on how to search for things on your computer :
http://www.tomsitpro.com/articles/window…arch,2-740.html
About Notepad :
http://howto.excitebuzz.com/open-notepad-windows-8/138