Subject says it all.
Click on "TAKE ACTION". Go down to "Reply with Quote".
There it is.
RTHOMPS instructions are correct.
HOWEVER, please don't quote a multi-paragraph post just to add a one sentence reply! You can also edit the quoted post to remove extraneous text and leave only the section that you need for your reply.
You can remove photos from quoted text as well, by using the delete key, leaving only a particular pic you are referring to in your reply.
Thank you all.