NextGEN Gallery is one of the most popular WordPress gallery plugin, and one of the most popular WordPress plugins of any kind, with over 6 million downloads.
NextGEN Galleries offers a very easy to use functionality for getting images from your desktop to your website. You can upload batches of images via a standard WordPress uploader, or upload images via zip file or FTP.
To add a new gallery:
Log into the DASHBOARD -> GALLERY -> ADD GALLERY/IMAGES. Click on ADD NEW GALLERY, name the gallery, click ADD GALLERY.
To add photos to a gallery:
Once logged into the DASHBOARD -> ADD GALLERY/IMAGES -> at the UPLOAD IMAGE screen, click on SELECT FILES, choose as many images as you would like, at the drop down menu, choose the gallery you would like to add them to, click UPLOAD IMAGES.
To edit a gallery:
You can view all galleries at the MANAGE GALLERY option. You can hover over the gallery name and make edits such as adding more photos or removing. From this screen you can also SORT GALLERY if you would like them in a particular order.
To add a gallery to a page/post:
In order to post the photo gallery to a page, locate the PAGE, place your cursor where you would like the pictures to be and use this code ie, with the correct gallery ID in where the X is. Update this information and the photo gallery should appear on the public site with the option to view the thumbnails or view as a slide show. Gallery ID numbers are located in the MANAGE GALLERY option in the first column.