Download Live Support module here and decompress it.
Login into your Provide Live Help Control Panel and click 
link in "My Account" panel. If you don't have an account yet, you can register
for free here. Now right click and copy into a clipboard the HTML code of live chat button. See 
in the figure below.
Edit livesupport_box.php file which can be found in a decompressed livesupport_1.0
directory and paste the HTML code.
See in the figure below.
Upload via FTP livesupport_box.php file to /catalog/includes/boxes/ directory of your osCommerce shop.
Edit /catalog/includes/column_right.php or /catalog/includes/column_left.php depending on which side you want the chat box on.
Insert this code shown below, where you would like the Live Chat box to appear:
// Live Support Box v1.0 include(DIR_WS_BOXES . 'livesupport_box.php');
Make sure Provide Live Help chat application is running and verify there is a green icon 
in your taskbar which indicates the application is connected. Open your osCommerce shop in a web browser and click live chat button to start a chat session.
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