How to change my logo?
You can do this in the Themes section. You need to be working on a copy of a template or on a new blank theme. In the customization panel, open the Logo section. If you want to use a logo from our collection, select one from the dropdown list.
Go to the Settings → Themes section of your form and click on Logo to view its options. If you want to use your own logo, select one of the available options: URL Image Logo or Local Image Logo. Provide your logo URL (e.g.: http://www.yoursite.com/images/logo.png) or upload it from your computer.
Take a look at this example of a form that uses a logo.