The first thing you do in each turn is determine which ships you are moving. The Move Action Panel will appear with a list of all your ships. To move a ship select one or more ships from the Ship Panel. The valid locations that you can move a ship to are displayed in the destinations World Panel. You can select a world from that panel and click "Set" to assign those ships. Alternatively you can drag ships from the ship panel and drop them on the Star Panel to assign them. Note: if there are ships displayed in the World Info Panel you can also drag and drop ships from there. A successful assignment will change the ships displayed on the Star Panel and will be reported in the status bar. If a assignment is incorrect for some reason, this will be indicated by a message on the status bar. When a ship has been assigned, the "to do" arrow will be filled in.
At any point you can click "Reset" to unassign all ships. All ships that have been marked to move will be reset to their original location.
When you have assigned all ships you can click the "Done" button to move on to the next phase.