Alternate (manual) procedure .... when composing your post put
the word quote within square brackets
in front of the material you want to appear quoted and
again in square brackets a slash (below the question mark) and the word quote to end the quote.
after the material you want quoted. The text between these two markers will then show up as quoted content.
If you want to take some long quoted text and intersperse your comments, not quotes, use this same technique to start and stop the quoting.
To see an example of this, click on the quote link of any message and you'll see these HTML markers in the body of the resulting message.