Just bracket the quoted text with a quote tag, like this:
Or, you can select text, then hit the quote icon in the upper right-hand corner of the editing window. It is the icon that looks like a word bubble.
If this makes no sense, a quote tag is simply the word "quote" placed inside the brackets that appear just to the right of the "P" key on most keyboards.
You begin the quoted text with the word "quote" inside brackets, and end the quoted text with a forward slash, on the same key as the question mark, just ahead of the same word, "quote."
It is probably easier to show you, than it is to explain.
This is a bracket: [
You insert the word "quote" next, then you close the tag with ].
You then include your text that you are quoting.
You close the quote by typing [
then /quote
then you type ].
You can learn about all tags permitted on this site on this page:
http://www.professionalsoldiers.com/....php?do=bbcode
Hope that helps.