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I have checked the form on your account, http://www.jotform.com/60063190751348, and here's what I'm seeing.
The form and the image you set above it are on the center of the screen already.
Are you still having issues? If yes, could you be a little more specific about the issue you're encountering so we can further help you, please? Can you give us more details on how you would like your form to look like so we can try to check if it is possible?
We will wait for your response. Thank you.