Follow the instruction below:
You need to add the code in the following format within the Text view of the editor.
1) Don’t forget to take a backup of the file prior to any change.
2) Open vertoh/event-framework/helpers/cpt/query-manager.php via FTP or Cpanel.
3) Search for the following line:
$registration_code = get_post_meta(get_the_ID(), ‘session_registration_code’, true);
4) Replace that line with the following:
$registration_code = do_shortcode(get_post_meta(get_the_ID(), ‘session_registration_code’, true));
5) Update the file.
Please note this is the theme core file, so you will lose the changed files when you upgrade the theme.