Shared Whiteboard is a WordPress plugin that makes it easy to add interactive whiteboards to your posts and pages.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Shared Whiteboard" folder is added on left sidemenu. Now, Click on "Shared Whiteboard" folder.

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

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

Guide
Basic installation steps: Download “Shared Whiteboard” Upload content of the archive into “wp-content/plugins/” of your WordPress installation Go to the administration panel, choose “Plugins -> Installed Plugins” and click on “Activate” If you’re using shared whiteboards, in the plugin settings page (Plugins -> Installed Plugins -> Shared Whiteboard -> Settings) set the API key (if you don’t have it already, you’ll need to subscribe to the AWW premium service first). That’s it! When editing a page or a post, click on the AWW icon to add the plugin shortcode and set additional options.

Guide

Basic installation steps:

Download “Shared Whiteboard”
Upload content of the archive into “wp-content/plugins/” of your WordPress
installation
Go to the administration panel, choose “Plugins -> Installed Plugins” and
click on “Activate”
If you’re using shared whiteboards, in the plugin settings page (Plugins ->
Installed Plugins -> Shared Whiteboard -> Settings) set the API key (if you
don’t have it already, you’ll need to subscribe to the
AWW premium service first).
That’s it!

When editing a page or a post, click on the AWW icon to add the plugin
shortcode and set additional options.

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Reffered: https://wordpress.org/