Add theme's or plugin's options to the WordPress Customizer. Build theme and plugin options accessible from WordPress front-end.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide
1. Download and install Customizer Plugin Currently only available via downloads section. 2. Activate the plugin 3. Configure Settings If your theme or plugin is storing options in a formalized format (recommended) you will have to configure this section. Select Use Serialization and specify your options name. For example if you are storing your options in my_options[option] format then the value of this field should be my_option. configure serialized options Don’t forget to save your changes. Note: If you are working with more than one options array you will have to set your Sections and Controls (more about them in the second part of the guide) for the first table, go back to customizer options, change the Serialized Options Group Name and continue working on the second array in the frontend Customizer editor. 4. You can start working with Customizer. See the second part of the guide: Working with Customizer.

Guide

1. Download and install Customizer Plugin

Currently only available via downloads section.

2. Activate the plugin

3. Configure Settings

If your theme or plugin is storing options in a formalized format (recommended) you will have to configure this section. Select Use Serialization and specify your options name. For example if you are storing your options in my_options[option] format then the value of this field should be my_option.
configure serialized options

Don’t forget to save your changes.

Note: If you are working with more than one options array you will have to set your Sections and Controls (more about them in the second part of the guide) for the first table, go back to customizer options, change the Serialized Options Group Name and continue working on the second array in the frontend Customizer editor.

4. You can start working with Customizer.

See the second part of the guide: Working with Customizer.

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Reffered: https://wordpress.org/