Signature, signature at the end of each entry Options

[Thunderstruck22]

I really would like a code to put in my xanga to make something just like this at the end of each post-

Copyright M.G.- Anything you say about this blog will be misquoted and then used against you.

And I'd like it in italics. Here's what I need-

1) the code
2) where do I put it
3) tell me where to insert the quote I just posted and how to edit the text size of it.

Thanks guys, you truly are amazing!