HerenIstarion - check your PM's and give it a try!
Scroll to the bottom of a PM you've been sent. At the bottom right corner is a 'forward' button and a 'quote' button. Choose the 'quote' button - it sends back a reply to the one who sent you the PM you want to reply to that includes the PM text sent you.
I think it's strange they didn't just call it 'reply' - but they didn't!
~*~ Pio