Hi! Thank you for using the Gateway, I'm really glad to receive feedback from actual users.
I'm not sure I understood what you're trying to achieve. If you want to start the scene at a specific knot, this is dealt with by Ink and there's no need to use the "Ink/Jump To" command in a Fungus flowchart. Just put -> knot at the beginning of your Ink script.
But if you want to control the flow from a Fungus flowchart, you can do that. The example scene in https://github.com/maurovanetti/inkfungus-template gives you an idea of how you might do that. Can you explain better what happened in your case? You said that it correctly jumps to the right know, but nothing happens, which makes me wonder how you found out that it correctly jumps there.
Silly question: are you sure you are talking about the "Ink/Jump To" command and not the "Flow/Jump" command?
Let me know and sorry for the late response, I was ultra-busy… playing Oxygen Not Included. :-)