Another option is available for you: you can go to your account->Sales->Customers to find the customer who can't login to your account and reset his password. He'll be able to change the password after he accesses his account.
Another option is available for you: you can go to your account->Sales->Customers to find the customer who can't login to your account and reset his password. He'll be able to change the password after he accesses his account.