The quote tags need to be on separate lines, by themselves.
However, the best way to quote another poster is to highlight the text you want to quote and click the “Quote” button that appears. That will insure that the quote is properly formatted and links back to the quoted post.
Since the answer was so fast, I have another question and, rather than start a new thread, I’ll ask here: What is the time limit for editing a post? I think it used to be five minutes but now it’s longer.