To add a provider to the Internet Explorer Instant Search box. Follow below steps:
1. Click Here for opening the web page with search engine providers.
2. Select on search engine which you want to appear in your internet explorer.
3. In the “Add Search Provider” dialog box, Check the checkbox “Make this my default search provider” for making the respective search engine as default search engine for your Internet Explorer.
4. Click on “Add” button.
Now, at the top right of Internet Explorer you can see that the search engine you have selected has been made as default search engine.