After you click the Create a New Gallery button you will then see the Edit Gallery page. This page gives you the opportunity to add more images, drag-and-drop the order, change image Titles, Captions, and Descriptions (which can optionally be displayed in the slider with the images if defined).
Now you can click the Insert gallery button, and a [ gallery ids=”200,202,210,…” ] shortcode will be inserted into the Show Posts post. You can now Publish the slider post.
Note that once the gallery short code is added to a Page or Post, it will display as a large, blank gallery “icon”. You can click the icon, and Edit and Delete buttons will be displayed in the upper left. Use the Edit button to edit the gallery – add new images, delete images, and change the sort order.