The Yahoo Toolbar enables users to perform Web searches using the Yahoo Search engine, among other features. While the Yahoo Toolbar itself does not store your search history, Yahoo Search keeps a log of the searches you performed. Delete your previous searches by visiting the Search History page on Yahoo's website.
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Delete Your Yahoo Search History
Visit Yahoo.com and log in to your account.
Enter keywords or a key phrase in the search field of the Yahoo Toolbar and click Search to open a new Yahoo Search page.
Click the cog-shaped Settings icon to open Yahoo Search's Settings menu, and select Search History from the drop-down menu.
Delete specific search terms from your search history by clicking the trash can-shaped Delete icon next to them.
Delete your entire search history by clicking the Clear History button and confirming your selection by clicking Delete.
Clear Your Browser's History and Cache
In addition to deleting your Yahoo search history, consider deleting your browser's history and cache to further protect your privacy.
Microsoft Internet Explorer
Open the browser and press Ctrl+Shift+Delete to open the Delete Browsing History window.
Tick the check boxes next to Temporary Internet Files and History and click the Delete button.
Open the browser and press Ctrl+Shift+Delete to open Firefox's Clear All History window.
Select the time range for which you want to delete the browsing history and cache, tick the check boxes next to Browsing & Download History and Cache, and click the Clear Now button.
Open the browser, open the Chrome menu and select History.
Click the Clear Browsing button.
Open the drop-down menu and select the time range for which you want to clear the cache. Tick the check boxes next to Browsing History and Cached Images and Files and click the Clear Browsing Data button.