I explain it to new players as "INF gives you get two movements for your disks. You can move a disk from track to hex (adjacent to another disk or ship, or containing one of your ships) or you can move a disk from hex to track. Choose either one. You can move 0, 1 or 2 disks this way. If you move from a hex, any cubes on that hex go back to your production tracks, not to the graveyard."
Re: A Quick Guestion about the Influence action