If you are using Internet Explorer and your passwords are being saved there are two things you can do.

1: Open Internet Explorer and click on Tools > Internet Options. Click on the Content Tab, look for the AutoComplete section and click on the Settings button. In here you will find a list of options that tells Internet Explorer what to save, look for the User names and passwords on forms option and make sure the box is unchecked. You can also find in here the option to delete the history that has been saved.

2: You can also delete browsing history in Internet Explorer by clicking on Tools > Delete Browsing History. In the pop-up box you can select all the information saved that you want to delete, including saved passwords.

I hope that helps and thanks for visiting.