1
If you signed up with Apple, Google or Facebook, sign in the same way. There is no password on the account.
2
Otherwise use Forgot password on the login screen. The link is good for an hour.
3
A confirmation code not arriving is almost always the spam folder. It comes from Reloot and works for 15 minutes.
4
Passwords need 10 characters with an upper case, a lower case and a number.