If you're skimming through your passwords in Apple's Keychain and notice that some are not accurate or up-to-date, you can easily remedy this. First, open Safari and go to the website of your choice. Next, type your login credentials but don't click 'Login' just yet. Note: If you're already logged in, log out of the account. With your password typed in the field, click on the keychain icon. Then, click 'Save Password.'