Quoting text ... there are two ways to post text as a "stated quote" ...
1. Use the "Quote" link at the top of any post, then as John has said, edit the text as required - taking care to only change the parts between the square brackets for [ quote ..... ] and [ /quote ]. And for tidiness, also make sure any trailing space before the [ /quote ] is also deleted.
2. Copy just the required text from any post. Then use the regular Reply button followed by a paste of the copied text. After that, highlight all of the pasted text and click on the "Insert Quote" button (6th "button" from left on the lower line of "buttons" above the emoticons).
(For 2. you can use the "Insert Quote" first and then paste the copied text between the square bracket bits ... thus avoiding the need to highlight all of the pasted text.)