First of all, take a look at Reply Mode/Button Confusion as that definitely is a must-know precursor to starting a Reply (with quoted material)
For those that used the
or

For those that used the
(full edit box)
For those that used the
(no edit box)[ quote] some text [ /quote]
For those that started a
or used the
and want to make something stand out as Quoted
(on hold right now while I try to go find out why img tags aren't accepting alt tags here ....)