Language
You need a form on your website so that the users can contact to the website owner.
The most popullar plugin is the "Contact Form 7".
It is one of the plugins that you want to install with the WordPress.
In this article, I would like to inform about how to install, and tell you the part that have to be careful.
You can see the pages of how to use it, and understand other settings from the below URL.
English page
http://contactform7.com/docs/
Japanese page
http://contactform7.com/ja/docs/
I will tell you how to install.
Click "Plugins" from the left side menu.
Click "Add New".
Type "Contact Form 7" in the keyword section.
Click "Install Now".
Click "Activate Plugin".
You will see "Contact Form 7" on the list.
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