To update your gallery page, login to the Dashboard of the website.
1. Go to Pages > All Pages and find or search the page you would like to update, hover over the page name and select Edit
2. Scroll a little down the page and click the Edit icon
3. Click the gray box that has the + in the top left.
4. From here you can drag and drop, or search your computer for the images you would like to upload.
5. Click the green button Use This Media
6. From here you can order the images by dragging and dropping the images into position.
7. Once done click Save Options at the bottom of the window.
8. Then in the upper right click the green button Update.