Netscape Navigator 7.x
Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.
Netscape Navigator 4.x
In Netscape, all cookies are stored into one file, called Cookies.txt, in the user preferences folder, making them easy to find and delete.
The folder can be located by using your file management software to search your hard disk drive for "cookies.txt".
Users of Netscape Navigator 4.x may also stop cookies from being written to the hard drive, by making the cookies file read only.
However, even if the browser can't "write" cookies to the hard drive, it can still cache them, and it may create a new cookie file.