MySQL config change to use more memory

hello,

as i described in the topic subject, i want to change the mysql config to use more ram, because right now my mysql is earn so many cpu usage, while i have ~10GB free (fully unused!) memory :\

this is not good, please help me to change mysql config to use more memory

here is my live mysql usage: http://i.imgur.com/3sLSwkC.png
as you can see, my FREE MEMORY is too much


thanks
bye

when you get more traffic it will automatically use your server's ram