If you already have a slideshow and you are wondering how to re-arrange the images, here is the process explained in a few steps:
1. Go to “my slideshows” page, your slideshows will come up and you will have to hover your mouse over the desired slideshow and click on the "edit" button.
2. After clicking the edit button, the editor will appear, if you scroll down you will be able to see the pictures that are included in the slideshow.
3. Now you just need to click an image, and while holding it, drag it to where you want it to be in the slideshow using the "drag and drop" method.
4. After selecting the order for the pictures, just click “Next” and you will be taken to the customize section of the editor in which you can also make different changes to the slideshow if you wish, or if not, just click the “Publish” green button and that's it!
Your pictures are now placed as you set them, and you can view the new slideshow in the order that you desired. Here is a short video tutorial of all of the steps from above: