I am writing my cover letter for apple creative job. Who should I title it to? Dear...?

If you are applying for a specific position from the Apple web site, it will usually list the name of the hiring manger. You can address it to him. If you are not applying for a specific position, Roger has it right, contact Apple Corporate.

And, in addition, I would suggest writing proper English and not using wrds like "wanna".

Start here: http://www.apple.com/contact/ - click the icon at bottom right to change country if necessary. The 'Apple Corporate' numbers would presumably be able to advise you who to write to.