DW Question & Answer

I was able to install DW Question & Answer

http://bacho.vietnamexpats.net/question/

But when click to view a topic it showed 404 error page

Could you please help to check it? Here is admin account

http://bacho.vietnamexpats.net/wp-admin
Username: admin
Pass: admin@07

And want to keep Post name for Permalink Settings

Thanks so much
Nguyen