Indexing sidebars, widgets, shortcodes, and toggles

I am not a developer, so I apologize if this question is ignorant. I am building a website on MAMP using Elegant Themes’ “TheProfessional” template” on WP 3.7.1.

I have read the instructions but cannot figure out how to set up Relevanssi so that it will index the text in the theme’s sidebars and toggles. I did not find the ‘query_post’ line in the search page template. I tried disabling the other plugins. I have checked and unchecked various boxes in the settings. Typing ‘all’ into the ‘custom fields to index’ box broke the theme.

I searched the WP forums, and the one promising piece of advice I found was to add this to the theme functions.php:

add_filter(‘relevanssi_content_to_index’, ‘add_more_content’, 2);
function add_more_content($content, $post) {
$stuff_you_want_to_add = function_that_returns_the_stuff_you_want($post->ID);
$content .= $stuff_you_want_to_add;
return $content;
}

I don’t know how to do this, though. Do I do this?

add_filter(‘relevanssi_content_to_index’, ‘add_more_content’, 2);
function add_more_content($content, $post) {
$stuff_you_want_to_add = sidebars, custom_functions, widgets($post->ID);
$content .= $stuff_you_want_to_add;
return $content;
}

Thank you in advance for your advice.

http://wordpress.org/plugins/relevanssi/