So I will have a go but exuse the very non technical language...
You need to press the quotes button ( 6 along from the smiley faces) then click your mouse in the space between the two (QUOTE) words. Then go to what you want to quote on another post and copy and paste it into that space between the (QUOTE) words. Oh dear that's a pretty rubbish explanation - I shall stick to my day job and not have a career change to I.T
Does that help??
starfish