How to get root password at online.net server?

Hello,

I have just bought dedi server at online.net During installation they have offered me to create user and I know password for that user. But when I login to server with sftp client and want to create folder it says permission denied.

So, I guess I should login with root user but I don't have password.

Or how can I add this user to have the same privileges like root?

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