Need a little bit of help here...If I want to reply to a topic and wish to quote a certain paragraphs eg lines 5 and 6 only and not the whole write-up how do I go about it...Thanks

You use the Reply button under the post you wish to respond to. Then cut everything you don't want between the opening and closing quote marks.

[quote] text here you want to keep [/quote]

Alternative is to select/copy the text from the post then Add Reply, which will be an empty window, then paste it into it. Then select the text you pasted and click on the "wrap in quote tags" icon above the window. The first method keeps the members name you are quoting, the 2nd does not.