Go to the YouTube login page and click on the "Forgot password?". Follow the steps and enter any information you remember about the account, like username, used phone number, or any recovery email address you given.

If you select your profile picture in the top-right corner of any YouTube page and select Settings, you'll get to the account settings page. From here, you can change general settings, like your password and email preferences—basically how often YouTube sends you email updates.