You can also preview how your signature will look under posts by using the preview button under the editing box.

If I could, I would suggest that you forego the actual "quote" tag. It has a nasty way of adding lots of extra line spaces around the box, so it makes your quote look kind of strange and out of place. Whenever I have a quote for my sig file, I just put quote marks around it, and it looks just fine. Let me know if you would like me to help you fix that up. :)