Messed up ingame settings

[BataKile]

so yeah, when i turn on the game and change settings it works, next time i turn it on, settings return to default. It's really annoying and i hope anyone can help me, please

[Proterean]

 That is due you to your World of Warcraft folder being read-only, specifically WTF\ folder.
To solve this: Right click on WTF\ folder -> properties -> remove read-only property. Next time you close your client your settings will be saved.
http://imgur.com/5wWKUL6.gif

Taken from the FAQ.