Hello to all, i am new in here and finally i found how to change the meters, but my problem now is bigger because i can't open the preferences tub to do the change. it shuts me out. I do not know why and only the preferences, everything else works just fine. Please please Help! [:)]

Hallow i just download the program and is great, but i am from Greece and we have meters and centimeters and in the panel is only inches. I would like to change it in meters but i cannot find how i do it. If anyone knows the way please please tell me. Thank you in advance [:)]