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I'm not sure if this is a redundant post which possibly that I have addressed the concern found on this link.
However, for better clarity, you can use the image form element under Basic Fields and upload your logo there
This user guide will help you understand how to use the Image field: https://www.jotform.com/blog/13-More-Options-for-Adding-Images-to-Your-Forms
If you have questions, please do let us know.