Try login via
https://x10hosting.com/control/ (Account Management Panel)
Click » View Details in the yellow box, you will be presented with
"Hosting Account Management".
Click "Login to cPanel" and change file permissions using file manager.
For FTP:
Your cpanel username is the lower username in the yellow box.
But, you would need cpanel_username's password or have to create new FTP account.
To reset password:
Hosting Account Management >> Change Password