Insert text to xenforo editor with redactor api

Question

With document.ready event I want add a string = 'bla bla bla' to redactor editor in xenforo i'm try

$('#ctrl_message_html').redactor('set', 'Your text goes here');
$('#ctrl_message_html').redactor('inserttext', 'Your text goes here');

but it don't have any effect...pls guide me how to insert it with xenfor redactor editor thank you very much!