First of all activate the Yrfaq and Yrfaqbutton plugins in your Joomla administrative panel > System > Plugins > in search field, write the names of plugin and activate.

In articles, in the editor you will find the YRFaq button that allows you to select the FAQ category and set other settings

After pressing the button, the modal window opens, which allows you to select the FAQ category and choose other options.

After selecting the category and other parameters, press "Save and Close" and the shortcode will be inserted into the editor.