How can i change my resolution ?

how can i change the resolution ( when i push option botton it starts the game and i can't change it) becose my eye's is on pain and i can't play.

p.s. sorry for my bad english but i don't speak very well this language.
Answer me on english please!

if i press start game or game options i get : Sync. Out of range lol
and dono what to do

to change it go to you're darkness v3 client folder -> setting's and change ur resolution, the above one to ''1024'' and second one to ''768'' then it's the normal size, hope it helped....then just save it and run kal