Zero output, horrible documentation

I installed and integrated the plugin, followed instruction in the documentation, absolutely cannot get any output out of this thing. Completely confused as to how this has such stellar reviews.

I have ‘theme options’ in my Appearance panel, created a new section/field, and added this to my header:
<?php
if ( function_exists( ‘ot_get_option’ ) ) {
$flow_desc = ot_get_option( ‘blue_header_snippet’, ‘default input value goes here.’ );
}
?>

Got nothing.

https://www.ads-software.com/plugins/option-tree/