Suppose, you have installed the WordPress. If you do not know how to install the WordPress, contact your hosting provider or see the document – https://codex.wordpress.org/Installing_WordPress

Now,

• Log in to the WordPress Dashboard
• Navigate to the Plugins → Add New → Upload Plugin; Click on Choose File and select the zipped file named easy-accordion-pro; Click on Install Now;
• Click on Activate Plugin button.
• After activating the Easy Accordion Pro plugin, you are ready to add Accordion in your post, page, widget or anywhere you like.