www.wysiwygwebbuilder.com

Was wondering if I can extract out whatever it is on the website now and open with wysiwyg through FTP? And also possible to extract back to do some amendments from the web builder itself?

Only the html can be imported the css and the scripts has to be adjusted from within WWB. Even if a website is made with wysiwyg web builder you cannot just import everything from the raw files.

This may be helpful:
https://wysiwygwebbuilder.com/import_html.html

I am planning to build E-commerce online website. How do I add in the portion to register and become my members to be able to check out from their shopping cart and all the transaction and history each of them holds individual.

And also, how to set it automatically settled in the best optimized mode to view in Desktop site, Tablet site and Mobile site.

Please see all of the following

I am planning to build E-commerce online website

Ecommerce:
Adding a PayPal Buy Now button to your website
Creating a basic PayPal Shopping Cart
Building a PHP Shopping Cart using WYSIWYG Web Builder
Ecommerce Integration
Ecwid Shopping Cart
Vibracart Pro
Updated:
PayPal Shopping Cart

And also, how to set it automatically settled in the best optimized mode to view in Desktop site, Tablet site and Mobile site.

Which layout mode should I choose?
Related Topic:
Responsive Web Design FAQ

How do I add in the portion to register

Login Tools Questions

Can you also please open a "New" thread for all questions related to any of the above so not to overlap and cause confusion. Thanks.