Edit php script to help my site work

i bought a full script from a website i was told all i need to do is upload it to my server and goto the [login to view URL] file when i access the [login to view URL] file i am hit with unathorised use by datopia ??? i bought the script from site vital no matter what file i access it bounces back with the same error, however i have all the files everything, all php files html, jpegs etc you get the point. i have experience in html however none in php scripting hence my desprate need of help and to make matters worse im on a deadline ish, all i need is some one to edit the files so i can upload it to the server and get the site running asap. the script is for a pay per view adult video flash chat,