How to unlock my passwords

A bit more detail as to where you are encountering this would help. If I have to guess I think you're most likely seeing this:

"With iCloud Keychain, you can keep your passwords and other secure information updated across your devices."

Read how to 'Set up iCloud Keychain'; click here --> https://support.apple.com/HT204085

If you're not using two-factor authentication, you might be prompted to create an iCloud Security Code—six digits, complex alphanumerics, or randomly generated—to authorize additional devices and verify your identity. If you forgot your code, you might be able to reset it ( https://support.apple.com/kb/HT202755 ).