Are you on a mac or a pc?

From Windows XP (pc, obviously) it's:

Start-Control Panel-Internet Options-Browsing History(Delete)-Delete Temporary Internet Files/Cookies/History/Form Data/Password*

*You can do any or all of those that you want to. You need to definitely delete cookies and probably TIF & History. I personally always do the "delete all" choice. But that's up to you.

HTH!