Can't access to Dashboard

when I restored My cloud back to the first state, there was a caution of problem
Then, I reset up and got this announcement “Your WD My Cloud is secured. Enter the Admin username and password for access to the device". In fact, I signed up by my e-mail address but haven’t got the password. Now I have the Admin user name without password so I can’t not continue the process. Plz help!

Thank you, however I pressed the reset button to restore.