We need to install the WordPress Gallery Plugin – NextGEN Gallery plugin before starting this recipe. Follow these steps to install and activate the plugin:

1. Log in to Dashboard as an administrator.
2. Click the Plugins | Add New button.
3. Search for WordPress Gallery Plugin – NextGEN Gallery in the Search plugins field.
4. Once the plugins are listed, click the Install Now button.
5. Click the Activate button to activate the plugin.

Now, you are ready to start this recipe.