How do I activate the logs of arena?

Hi guys,
I wanted to know how to activate the arena.log happened here a picture of my setup
http://puu.sh/n7Nzd/b3a38d9170.png

http://puu.sh/n7NDO/5010e2ed52.png

take a look at https://github.com/TrinityCore/TrinityCore/blob/6.x/doc/LoggingHOWTO.txt