How can I add Gravity form and style it using Upfront?

Greetings,
I read the Upfront Part 5 tutorial and followed the instructions there to add gravity forms in upfront.
https://premium.wpmudev.org/blog/upfront-plugins/
In the tutorial, it says Drag widget and select "form" from the dropdown menu. Unfortunately, there is no "form" in the dropdown menu of the widget.
Can you guys help with this please.
Thanks
Burak