Download Live Support module for Joomla 1.5 here.
Login into your Joomla administration panel and select Install/Uninstall from Extensions menu - see 
in the figure below. Click Browse button 
and select mod_livesupport.zip file. Finally click Upload file & Install button 
to install the module.
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.
In Joomla administration panel select Module Manager from Extensions menu - see below. Next click on "Live Support Chat" in the list of available modules. Paste HTML button code into field , select "Show Title" ⇒ "No" radio button 
, enable module by selecting radio button 
. Finally decide where you want your chat button to appear 
and click Save button 
.
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 Joomla site in a web browser and click live chat button to start a chat session.
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