How to add an image gallery
You can create a post that presents a grid of image thumbnails. Here’s an example:
To insert a gallery into a post, upload a number of images and then click the Gallery tab in the Add an Image dialog box.
Each photo in the gallery will be listed at the top of the Add an Image dialog box. You can reorder the images by dragging and dropping them into the desired position.
To insert the gallery in your post, click the Insert gallery button at the bottom of Add an Image dialog box.