Dmitro, здравствуйте!
Цитата:
Login After Installation
Following a successful install, you may log into your phpCOIN:
* Ensure you are attempting to log in as an Admin. You should clearly see the "Administrative Login Required" message on-screen.
* The default username is webmaster
* The default password is <whatever your database password was during install>
Вывод - Логин:
webmaster (по умолчанию) Пасс:
Пароль от БД.
Всё было опробовано на локальной системе.