If you wish to rearrange the order of your pictures in your Gallery widget, here's how to do this:
1. Click Edit on the top left-hand corner of your Gallery widget.
2. For the picture that you wish to move, click on the arrows to move it up or down the list.
Here's another way:
1. To the right of the arrows, you can hover your mouse over the dotted rectangle until a "cross" appears. Then click and drag the picture to its new location.
2. Click Save.
3. Publish your site to apply the changes to your live site.