I'll tell you if you send me some of Mrs Mole's cakes
Just kidding, what Saraj said, just go into the quoted section and delete any bits you don't want. If you're feeling braver, you can even split up the original quote into several sections, say, if you want to reply to individual bits of it, and that will involve adding new "quote" tags. You'll see the square brackets and the word "quote" at the start of the quoted section, and then the same with a slash symbol at the end of the quoted section.