Can't find "Quote Original" button for Reply to a Post

When I went to reply to a post I wanted to use the same quoting format that I saw others had used. So I went to "Help & Terms of Use" to learn how to do this. The info given is: "If you want to quote specific text from the original message, click Quote Original to add all the text from the original message to the Message box." I could see no such button. So I replied without using the desired format and at the same time asked the person I was replying to about this. That person's reply back was: There's a '"' icon in the compose window when you type a reply. If I'm doing a lot of quotes (as I did here) I use that, then edit out the bits I don't want. Otherwise I copy and paste the text and add a > before the line to get it to appear in the special format.

I'm still mystified! I see no such button, icon or anything about "Quote Original" in the "Reply", "Compose" window. I also tried adding a > before the line, but nothing happened.

I was originally attempting this using the Firefox browser. To make sure the problem was not a Firefox glitch, I switched to Safari, with the same result.

How is "Quote Original" done? Where is that button?

Thanks in advance