You can hit the reply button at the bottom of someone's response rather than the main reply button at the bottom of the page. If you'd like to quote more than one person at a time, hit the quote button under each person's response, and then hit the main reply button at the bottom of the page. If neither of those work, you can put [ quote ] around their response [ / quote ] like that, but without the all the spaces ... I needed them so the code would show up in a way that you can see it.

Hope that helps.