Quote ="littlerich"After you've clicked the quote button just start typing under the stuff at the top of the new page you've been taken to.'"
In other words....
Click on the quote button for the post you wish to quote, then...
Move the cursor, (flashing line), outside of the quote tags, (square brackets), and continue to type whatever you wish.
You can alter the text inside the quote tags simply by deleting the text required and inserting your own.
Eg:
Quote ="littlerich" After you've clicked the quote button, your pc will self destruct in 5 seconds...'"
Hope that helps.