how to install ur own themes on ur forum

hii i want to install a theme in my forum and the theme is free source any1 can use it i have dovnloaded this theme from http://www.phpbbhq.com/?p=16 and it is free source as freeforums.org is also using this see http://moviesking.freeforums.org/ so can u please tell me how to install this theme on my forum as i can see import theme function is not working it says import ended and i tried uploading this to hitskin and it says please enter valid url wot to do now please help i really need this theme to be installed on my forum thanks...................