Start off by clicking Add Gallery | Image in the Gallery navigation. The screen will display a tabbed interface, allowing you to add a new gallery, upload a ZIP file of multiple images, import an image folder (located on your server), or manually upload an image one at a time.

Congratulations, you just created your first photo gallery. Now that we have a gallery with photos, let's insert it into a post. The process for adding a gallery to a post is exactly the same as adding it to a page.

Once you visit your Add Post or Add Page area of WordPress, you should notice a new icon available—this is your NextGen Gallery button.

On clicking the newly created button, a new pop-up window will give you the option to select which gallery to include and which method the gallery should be displayed in. Also available from this pop-up window is the option to include an individual photo or an album that contains multiple photo galleries.