Q&A Plugin is confusing me

I’ve been trying to configure the Q&A Plugin but it’s really giving me hard time. Under the setting there are two options that we need to chose the pages:

1 Thank you page

2. Unauthorized Access Page.

But on the manual it says that we need to create a custom menu with msyite.com/questions/ask. I created that menu with questions as the level but that does not work either.

So please help me to figure out how to configure the Q&A plugin.