How to remove the Jotform logo at the top of the form?

You can remove that in the form cover settings in the designer. However, you seem using a theme with that image from the theme store. In this case, you have to remove the image by using a custom CSS codes. You can inject the following:

.form-all:before {

display: none;

}

Here's how to inject: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes. 

Thank you worked a treat. :)
*Regards,*
*Alex Moody*
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