Dominick Amorosso already gave an answer just a bit more specific here
If your wordpress on root and q2a in sub directory than it would be like below
define('QA_WORDPRESS_INTEGRATE_PATH', '../');
If your wordpress on in sub directory and q2a on root than it would be like below
define('QA_WORDPRESS_INTEGRATE_PATH', '/');
path here means the path on the server not the url