Go to your installed plugins and click on the edit option of the plugin.
Start Editing wp-awesome-faq/index.php.
Below this line" // Getting FAQs from WordPress Awesome FAQ plugin's Custom Post Type questions." you will see the following lines of codes.
$args = array( 'posts_per_page' => 5, 'post_type' => 'faq', 'order'=>"DESC");
Now change 5 to 15 or any number you want and change 'order'=>"DESC" to 'order'=>"ASC"
All set now.