Get back in when the password will not come to mind.
On the login page choose Forgot password and enter your email address. A link arrives that lets you set a new one; it expires after an hour.
If the email does not appear, check the spam folder and make sure you are using the address you signed up with. Signed up with Google? Use the Google button instead — that account has no password here.
If two-factor is on you will still be asked for a code after setting the new password. Use a backup code if the phone is gone.