It's the first icon in my post above which appears on each post when viewing a thread.
Are you talking about on the message composition page? If so you are in the wrong place and you need to go back to the thread contents page.
The http://www.askaboutmoney.com/images/buttons/multiquote_off.gif image changes to http://www.askaboutmoney.com/images/buttons/multiquote_on.gif when you click it to include a post for quoting.
I'm selecting the text and hitting the button until it goes red each time and then hitting post reply but I can't get it to wrap quotes individually.
Not to worry. I don't really need to quote. Just wondered as I didn't know how to do it and everyone seems to do it. Thanks anyway.