I hope you are safe and sound during the evolving global pandemic.
First of all, I would like to thank you for this amazing and versatile toolbox.
I realized that dragonfly is linked with URBANopt, but there is no tutorial or user guide. Would you please tell me how can I access a user guide to use the URBANopt plugin?
Video tutorials are in the works. For now, the best I can point you towards is the Dragonfly sample files that were included with the installer that you download from Food4Rhino. In particular, the from_building_solids.gh shows how to execute the simulation using the URBANopt SDK. Make sure you have followed the last optional step of the Ladybug Tools installation instructions, which involves installing URBANopt.
For a deep understanding of plugins, their functionalities, and also understanding the concept behind each change in the simulator, videos can be more informative and helpful. I look forward to hearing from you about the videos.