At this point, you should see the Add Search Provider window, prompting you to add the provider chosen in the previous step. In this window you will see the name of the search provider as well as the referring domain. In the example above, we have chosen to add "eBay" from "www.microsoft.com".
There is also a checkbox present labeled Make this my default search provider. When checked, the provider in question will automatically become the default choice for IE8's Instant Search feature. Click on the button labeled Add Provider.