write faq using the regular post interface you familir with, and use a simple shortcode to publish it where you want.
Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from Plugins page.
you will see Faq menu apper and from there just press "Add Faq" and publish each question you want. each post is a question and answer, title for question and post contentas answer.
after you finished publish all your question, in the post\page you want to publish the faq just use the shortocde :
you can use one or all of three adittional parameters:
[faq width=300px color=blue order=asc]
inside your template you can use:
echo do_shortcode('[faq width=300px color=blue order=asc]');