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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Here's a guide how to get the image URL from a website:
1. Right click the Image from a website.
2. Copy the image address.
3. Paste the image address on the widget.
Also, you may want to check this guide: How-to-Display-Images-on-Secure-Forms
Hope that helps. Thank you.