The Coordinates is an information about the three planet outside the poptropica. You need to go to here and find the princess. The coordinates are: X-73 Y-83, X-15 Y-15, and X-83 Y-20.
How to Get the Coordinates
On the Castle, go up the stairs and enter the door at the very top. This is where you’ll find the King and Queen, who are distraught over the kidnapping of their daughter. Ask the Queen if she can think of anything else that might help you and she will give you the coordinates of the three knights who left in search of the princess.