Hi Edward,
Sorry for the inconvenient and my misunderstanding, seems like we did not update kunena signature in our app store yet, where it suppose version 2.2.1 (current version). This app actually already included in our component installation, perhaps we've overlooked this on our app store (I've inform our developer to update it in our app store as well).
And I've logged about the documentation for on how configure it into our issue tracker and our documentator will update it
Regarding the signature shows twice, can you create a new ticket for that, and provide us with access needed ( backend and FTP) so that we can troubleshoot further.
*I've attached the current version of kunena app below
Thanks for your cooperation and understanding Edward