How to reset password of Admin account? (source)

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Hello Everyone,

I am administrator of my WackoWiki website but unfortunately I forget my password. And when I tried to sent reset email, I just didn't receive any emails in my registered email address. But I didn't see any error occupied when I clicked the reset button.
How can I resolve it? It seems I can not use Admin panel or recovery password as common ways.

Thank you for any help.