Its easy enough getting the first one there, but to put a second or third you have to use the insert quote icon, which is the on the top line of icons on the 'post reply' screen.
First though, hightlight the text you want to quote and do a 'control+C' to copy it, then once in the reply window, click the insert quote icon and once you have
you just paste inbetween the two inner brackets using 'control+V'. Voila.
This SHOULD work
