In order to count incoming hits, you need to add a short PHP code to every page where your trades will send traffic to. All those pages must have .php extension, otherwise it won't work (you can't use .shtml, because some features of the script wouldn't work). If they don't have .php extension, rename them (if your index page is index.html, you need to rename it to index.php etc.). Then insert this code as the first line of the files:

<? include 'stt-in.php'; ?>

If the pages are in other directory than the stt-in.php is, you have to modify this code. You have to add '@' in front of the include command and you have to specify the path. The code will look like this:

<? @include './folder_name/stt-in.php'; ?> if the stt-in.php is in the 'folder_name' subfolder

OR

<? @include '../stt-in.php'; ?> if the page is in a subfolder

It's recommended to come to one of the pages where the code is inserted to and find out whether the hit was counted by the script.