I was looking at this yesterday and was amazed at how featureful it is. To promote/demote or move up/down a node, click or tap on the node and then tap/click t

I was looking at this yesterday and was amazed at how featureful it is. To promote/demote or move up/down a node, click or tap on the node and then tap/click the little arrow icon at the bottom. That will reveal directional buttons that allow you to do those things.