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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I have inspected your form http://www.jotform.co/form/61883420867868, but I did not saw sample logo. It seems that you were able to resolve your issue.
If you have sample logo on some other form, you can remove it inside of Form Designer. Inside of Form Designer open Form Cover tab, click on Clear option and save the change.
Hope this will help. Let us know if you need further assistance.