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I checked one of your form - http://www.jotform.co/form/53057221767860 and it seems that you are using your own logo in your form. Or, are you referring to the JotForm logo found in your Notification Email?
You can remove the logo in the Notification email by selecting the Image and press delete. Ensure to save your changes.
If you are referring to a different concern, please provide us more details so we can further check the issue.