Adds Colorbox/Lightbox functionality to images, grouped by post or page. Works for WordPress and NextGEN galleries. Comes with different themes.

Noted That:

To install correctly this jquery-colorbox.zip.
Fisrt Download the jquery-colorbox.zip to your computer
Extract/Open jquery-colorbox.zip to Your Computer.
Then, Find readme.txt file inside jquery-colorbox.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 "jquery-colorbox.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 "jquery-colorbox.zip" Downloaded plugin from your computer, Where you downloaded jquery-colorbox.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "jQuery Colorbox" folder is added on left sidemenu. Now, Click on "jQuery Colorbox" folder.

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

8. Now you configure yourself oR Watch video tutorial below about jQuery Colorbox Configurtions and Settings or How to work "jQuery Colorbox" 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 "jQuery Colorbox" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is jQuery Colorbox
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Upgrading From A Previous Version To upgrade from a previous version of this plugin, use the built in update feature of WordPress or copy the files on top of the current installation. Installing The Plugin Either use the built in plugin installation feature of WordPress, or extract all files from the ZIP file, making sure to keep the file structure intact, and then upload it to `/wp-content/plugins/`. Then just visit your admin area and activate the plugin. That’s it! Configuring The Plugin Go to the settings page and choose one of the themes bundled with the plugin and other settings. Do not forget to activate auto Colorbox if you want the Lightbox/Colorbox to work for all images. See Also: “Installing Plugins” article on the WP Codex

Upgrading From A Previous Version

To upgrade from a previous version of this plugin, use the built in update feature of WordPress or copy the files on top of the current installation.

Installing The Plugin

Either use the built in plugin installation feature of WordPress, or extract all files from the ZIP file, making sure to keep the file structure intact, and then upload it to /wp-content/plugins/.
Then just visit your admin area and activate the plugin.
That’s it!

Configuring The Plugin

Go to the settings page and choose one of the themes bundled with the plugin and other settings.
Do not forget to activate auto Colorbox if you want the Lightbox/Colorbox to work for all images.

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Reffered: https://wordpress.org/