The concept of installing the module.
1. Install the module the same way as you install any other module in DNN.
2. Create add the iWebs - Users Online module to a page on your site.
3. Click on the Gadget Download, open and install in the same way as any gadget in Vista.
5. Log in as a Host to your website. Go to HOST / HOST SETTING / ADVANCED - Un-tick the option for "Disable Users Online"
6. Go to HOST / SCHEDULE - Ensure that "DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE" is Enabled.
That is it, you should have a working module.