Reset it
On the sign-in page choose Forgot password, enter your email, and follow the link we send you. The link is single-use and expires, so request a new one if it has been sitting in your inbox.
No email arriving
Check spam, and confirm you are using the address you signed up with. A reset email is only sent to an address that has an account.
If you signed up with Google
Use Continue with Google rather than a password. Your password lives with Google.
With two-step verification on
You still need your authenticator code after resetting the password.