I accidentally inserted some text in a post and saw the quote/unquote popup appear.
But I cannot find how to make a selection as a quote.
I click on the <HTML> button and then insert this template:
<blockquote class="jive-quote">
<p>user wrote:</p>
<p></p>
<p>quote</p>
</blockquote>
<p>Reply</p>
Then replace "user" with the person you are replying to, replace "quote" with the text you want to quote, and replace "Reply" with your reply.
I think it leaves you with one extra line between the citation and the quote. You can delete it if you are careful. But if you delete too much, then it will get scrambled when you post.