Installing the NextGEN Gallery plugin
Before you can add any galleries, you'll need to install the plugin by performing these steps:
Go to Plugins | Add New.
In the search box, type
NextGEN
.WordPress will display the plugin. Click on the Install Now button.
Once the plugin has been installed, click on the Activate link.
You'll now find that a Gallery item is added to your admin menu, with a number of subitems you can use to create and manage galleries and albums.
Let's use one of these to add some galleries.