In doing this, don't type the asterisks in what follows. I put them in to disable the quote function.
Type [quote*] at the beginning of what you want in a quote, and [/quote*] at the end. Simple!
If you want to get fancy, you indicate who said what with [quote="username"] (quotation marks are needed) at the beginning of the quote instead of [quote] but I tend to do that only at the beginning of a post.
Hope that helps!
Joseph