Default shortcode name is ‘chatbot’ — can use like [chatbot]
If you like to change the name,
At ‘WP-Chatbot’ plugin – Settings page, At ‘Shortcode name’ field, change value and save.
Based on the above Image, Now the Shortcode name is ‘messenger’, use like [messenger]
Shortcode name must be unique to other shortcode names created by other Plugins, Themes added in your website or form the default WordPress Shortcodes.