Peter,
Italics are done this way - as in: `i, then a {, the text you want italicized, and finally a }. After the `i there should be no blank before the {.
Bold is with `b - and so on, checkthe Help/Instructions link at the bottom of the page.
One thing I haven't found is how to include an image that was uploaded in an earlier posting. It's easy to find out the number given to the image, but it doesn't say anywhere what formatting tag to use when trying to show it in another message.
Apologies for stepping in on an RIP thread - but to be totally honest, until today I'd never heard of George Carlin.