On the off chance that you can't access your Keychain from your Mac, you aren't completely out of luck. You'll need to set the password back to default (which means your Mac unlock password). Here's how: 1. Click on 'Keychain' in the far upper right corner of your Mac. Then, click 'Preferences.' 2. Click on 'Reset Default Keychains...' Now, you can try to log into Keychain again using the same password that you use to unlock your Mac.