The NextGen Nivoslider plugin allows you to create a NivoSlider, using images from your NextGen gallery, with a simple shortcode or widget.

Noted That:

To install correctly this nextgen-nivoslider.zip.
Fisrt Download the nextgen-nivoslider.zip to your computer
Extract/Open nextgen-nivoslider.zip to Your Computer.
Then, Find readme.txt file inside nextgen-nivoslider.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "nextgen-nivoslider.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "nextgen-nivoslider.zip" Downloaded plugin from your computer, Where you downloaded nextgen-nivoslider.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "NextGen NivoSlider" folder is added on left sidemenu. Now, Click on "NextGen NivoSlider" folder.

Noted that: If you do not see "NextGen NivoSlider" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about NextGen NivoSlider Configurtions and Settings or How to work "NextGen NivoSlider" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "NextGen NivoSlider" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is NextGen NivoSlider
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Important: You need to have NextGen Gallery installed for this to work! Installation through WordPress Dashboard: 1. Find the plugin by searching for “NextGen NivoSlider” and click install. That’s it! Manual installation: 1. Copy the entire directory from the downloaded zip file into the /wp-content/plugins/ folder. 2. Activate the “NextGen NivoSlider” plugin in the Plugin Management page. 3. Refer to the description to use the plugin as a widget and or a shortcode.

Guide

Important: You need to have NextGen Gallery installed for this to work!

Installation through WordPress Dashboard:
1. Find the plugin by searching for “NextGen NivoSlider” and click install. That’s it!

Manual installation:
1. Copy the entire directory from the downloaded zip file into the /wp-content/plugins/ folder.
2. Activate the “NextGen NivoSlider” plugin in the Plugin Management page.
3. Refer to the description to use the plugin as a widget and or a shortcode.

nextgen, nivoslider, simple, gallery, shortcode, widget, your, using, plugin, allows,

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Reffered: https://wordpress.org/