cannot install my own logo

hi there.
I am using fungames24 theme in wordpress. I am new to this and as far as i know i tried everything to install my logo and remove theme logo from header. now I am able to show my logo on header but it does not appear . it always seems to be broken link. as you can see in header of my web page . I tried to edit header.php but dont know exactly what to do . I already tried this from theme option still no luck. advice needed.
thanks in advance.