What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I am not really sure where you wanted to place the logo, but based on my assumption, I created screencast explaining how you can move the entire header blog anywhere in the form or alternatively, if you want to place the logo above the header text then you can remove image from header and create a new image using image field and place if above the header
You can visit https://www.jotform.com/blog/195-Did-You-Know-that-You-Can-Add-Your-Company-Logo-to-a-Form for reference of how to add logo image.
Let us know if you have more questions.