From the main page look down the right hand side and you will see a column called "Site Menu". Go down that and select "Discussion Forums".
A new page will appear. I would choose "Web Security" for cross site scripting questions.
If you are not sure I would suggest using "General Computer Discussions" and if it turns out to be something else then a moderator will move the thread for you.
In the top right hand corner there is a forum search box. Type in cross site scripting and then search.[ XSS won't work because it is only three letters.] That will show you previous discussions on the subject.
Last edited by nihil; February 22nd, 2009 at 02:07 PM.