It's very easy, actually. When you quote someone, you'll see two tags enclosed in brackets at the beginning and end of your quote. They'll say "[ QUOTE = username ; some-long-string-of-numbers ]" at the beginning and "[ / QUOTE ]" at the end (in both cases, without any quotation marks or spaces in them - I put them there to post that info without the board system thinking I was actually quoting someone). I would copy the initial string, the one with the username and post-identifier numbers, and paste that at the beginning of every separate idea you want to talk about, and type in the quote closer (the second string, with the backslash in it) at the end of each of those ideas. That way, each of the sentences or paragraphs you're quoting will be separated, and your replies will be easier to distinguish, because they'll be outside the quote box.