This depends on the browser you are using. For Internet Explorer, click on the cog wheel in the top right hand part of the browser, choose internet options, under the “browsing history” option, click “Delete”, check off the items you would like to delete (cookies & temporary internet files are the most common), click “Delete” and then “OK” to close this window. You may need to close and reopen your browser. For Google Chrome, click on the three dots in the top right hand part of the browser, choose “settings”, click on the “advanced settings” link, click “clear browsing history”, check the items that you want to delete, click on “clear browsing history”. You may need to close and reopen your browser.