Well, first, if you downloaded a free script, perhaps you should tell us what it is. We can not help you without seeing some code to fix. Also, if it is from a free download website, you could just post the site here and we can look at it on that site.
But, if you have code that is working, but, you want to change some section of it, just post that section here in this message. To do this, you select that section of the code in your editor and COPY it, then press the PHP tag above and place that copied code between the PHP tags. It will look like this when finished:
[php]
Some code…
[/php]
One this is in place, you can press the PREVIEW button to see what it will look like to us. Then, you can edit it or POST it.
We will be very glad to help you, but, we need to know what you want help with. If you want personal help you can do this by sending someone a Personal-Message (PM), but, the whole idea is to show the problem and solution so that others may learn, too. Hope that makes sense…