To change the order of Images inside of a Folder, click "Artwork on your Website" and then click the name of the Folder. Folders and Images inside that Folder are listed in order with a box containing a number to their left.

Change these numbers to the order you would like, then click Update. For example, changing the list of numbers from 1, 2, 3, 4, 5 to 5, 4, 3, 2, 1 will reverse the order of the folder's contents. If you just want to move one image from 1 to 5, just change that first number to 5 and the computer will take care of the rest. There is no need to change all the numbers.