To change the order of Folders on your Home Page, click "Home Page." You'll see the Folders listed at the bottom of the page 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.