To edit a photo you will have to register and login to MyGreatWorld.
Now you have to press "Your Photos" in your personal menu:
You will now get a list of all of your pictures. To edit a photo just click on the "edit" button below the picture.
On the following page you can edit all information of your photo including title, description, year, month and category. You can even change the spot where your photo has been taken. If you need to move a photo to another country, please contact an operator.