Hi Sorry for the generic post but each time I try to make a block quite it ends up looking like this. :C
It’s the icon at the top of the reply box that looks like a double quote mark. Type the text you want to put in blockquote and then hit that button.
If you’re quoting someone else’s post, though, just select the text there and a tool tip will pop up allowing you to quote it in your reply.
Third option if you’re quoting someone is to hit the reply at the bottom of the post and then click the chat bubble icon at the top of the reply box. That will insert the entire original post into your reply.
Good luck! 
(Edited to change urls to images now that I can.)
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