If you’re member sign up a new account using social login like facebook, google….they can change password then they can login using email + password instead if clicking on social login icon. There are two cases:
Sign up using social account and system can get the email. After finished sign up process, system will send user a welcome email and attach the password into email for member to use it to login using email + password
Sign up using social account and system can NOT get the email. After finished sign up process, user need to setup email and password at settings -> Add email and password
Then user can login using email + password instead of using social login icon.