Would you by any chance mean the quote function?
I'll assume you do.
If you look at the bar at the bottom of each post, you'll notice 3 buttons: Quote, (the one you should press) Multi-quote (I'm not sure what this actually dose...) and quick reply.
Alternatively, while editing a message for posting, hit the button at the top that looks like a speech bubble - the 'Wrap [Quote] tags around the selected text' button.
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