Seesiu for WooCommerce is a WordPress plugin that enable Woocommerce stores to give their customers the choice to make their deliveries greener.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Seesiu for WooCommerce" folder is added on left sidemenu. Now, Click on "Seesiu for WooCommerce" folder.

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

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

Guide
It’s as simple as this: * Download the Seesiu plugin, and add it to your e-commerce site * Once the Seesiu plugin is activated it will appear in the checkout section with the caption ‘Shop with Seesiu and make your delivery greener for just 75p! Click here to find out more’ * When shoppers opt in to shop with Seesiu, 75p is added to the transaction but you can go ahead and fulfil their order as normal * We invoice you monthly for all Seesiu transactions and use that money to procure carbon offsets, which in turn make your customers? deliveries greener. Simple. Minimum Requirements WooCommerce 4 or greater is recommended PHP 5.6 or greater is recommended MySQL 5.6 or greater is recommended

Guide

It’s as simple as this:
* Download the Seesiu plugin, and add it to your e-commerce site
* Once the Seesiu plugin is activated it will appear in the checkout section with the caption ‘Shop with Seesiu and make your delivery greener for just 75p! Click here to find out more’
* When shoppers opt in to shop with Seesiu, 75p is added to the transaction but you can go ahead and fulfil their order as normal
* We invoice you monthly for all Seesiu transactions and use that money to procure carbon offsets, which in turn make your customers? deliveries greener. Simple.

Minimum Requirements

WooCommerce 4 or greater is recommended
PHP 5.6 or greater is recommended
MySQL 5.6 or greater is recommended

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Reffered: https://wordpress.org/