WordPress.org

First, Get your chat code:

1. Enter your email & choose a password at http://www.rumbletalk.com
2. Then click on the "Get Chat Code" and get the code for wordpress.

Second, Install the Plugin:

1. Upload the rumbletalk-chat directory to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Click 'Settings' and then 'RumbleTalk chat'
4. Add a the chat code. (Optional - Enter the chat width and height e.g 400 x 300)

Add the chat to your chosen page:

1. Use the phrase '[rumbletalk-chat]' in your posts text (you can do it in visual mode, no need to switch to HTML view) in order to position the chat widget exactly where you need it.

Full instructions can be found here:

http://www.rumbletalk.com/wordpress-chat-plugin.php