Kaya, it is fine that you aksed it here, but there is a forum dedicated to asking such question or reporting problems, etc. It is the "Whip the Administrators" forum.
To answer your question, while you are typing in a reply, you can highlight some text and then click on that button, it will place that text into your reply and surround it with the bbCode markup codes to include that text as quoted material, like this:
Quote:
this is a sample of quoted material. The button does not work for me, so I entered the markup code for this effect by hand.
I doubt that it will work for you Kaya, or for you either Melamkish. The functionality of the button depends on the certain member functions being avalable for the document class provided by the Java script interpreter used by your web browser. It does not work for mine, so assuming that since you are using the same brower version though on a different OS, the Javascript interpreter would be similar. So it is does not provide the needed function.
OH, don't you two feel bad about hitting that button by accident. Before the last major software upgrade of this site, the quote button, the one next to the edit button was located next to the report message button. So at that time, many of us kept hitting the report button instead to the quite button. Resulting in many false reports of problem messages, most of those reports were sent to the entire staff. ;-)