
Deleting saved user names and passwords
If you select the option in the AutoFill preferences pane to automatically complete user names and passwords, Safari saves any names and passwords you enter in web forms. You can delete this information if you are concerned about someone else getting access to it.
If you select "Never for this Website" when you enter a name and password for a website, your password will never be saved for that website. If you want to save your name and password for the site in the future, you can change this preference.
Choose Preferences from the Safari menu and click AutoFill. Click Edit next to the "User names and passwords" checkbox. Select the item you want to delete and click Remove.
If you selected "Never for this Website" when you entered a name and password for a website and you want to save the information now, select the website in the list (it should show Passwords Never Saved in the User Name column) and click Remove.
If you want to delete all the items, click Remove All.
If your user name or password changes, simply replace the current name and password with the new one when you open the webpage. Safari asks if you want to save the new information.