Trying Q&A - what do i do to get this working.?

i got this after installing it -

[Q&A] After Visitor Submits a Question setting requires registration of the visitor, but your website is closed to registrations. You may consider to fix this using plugin settings or Wordpress settings.

but when i click on *settings - it takes me to the same exact page i'm on - which is the configuration page of Q&A.

let me know how i can get this working right away.

i need something today or i'll have to purchase someone elses plugin.