Plugin has no obvious way to "Ask A Question" out of the box.
I was confused as to why there was no obvious way to ask a question after first installing v1.2.2 of this plugin.
If you're also confused, take a look at class.qna.plugin.php. The Base_BeforeNewDiscussionButton_Handler() method is commented out. If you remove the comments, your "New Discussion" button will have a drop down menu like the Vanilla community forum does with an "Ask A Question" option.
Now, why this is commented out, I have no idea....?