If you are receiving the message "You do not appear to have the Plugin installed", you'll want to make sure that plugin is installed. Click on the following link for a guide on installing the extendedReach plugin: Installing the extendedReach Plug-In
If the plugin is already installed, there could be a few reasons why it is saying that the plugin is not installed:
1. It was already installed on the computer, and the computer was not rebooted yet -- Try rebooting the computer.
2. Antivirus software is stopping it from working -- Try disabling that.
3. Another browser plugin is stopping it from working -- Try a different browser.