WordPress Plugin that adds AJAX based data Insertion and Retrieval. By default it is added to WP page content area, but you can modify it based on your needs. You can use this plugin as the base form plugin for creating WP AJAX Forms.
The manual installation method involves downloading Wpik WordPress Basic Ajax Form’ plugin and uploading it to your webserver via FTP application. You may find more
instructions on how to do this here (https://codex.wordpress.org/Managing_Plugins#Manual_Plugin_Installation).