Hi,
When you searchanything on Bing you will get a drop down list of frequently visited websitesor suggested websites at the very bottom of the list you will see the option"Manage Search history" click on that, from there either you canclear every thing or delete the unwanted search history. You can also managethe Bing search history by clicking on the settings icon which is located onthe top right corner of the Bing screen.
Thanks and regards
Mubarak