Here's a quick overview on the most common ways to format your posts.
!! You have to leave out the extra spaces within the []. !!

Add code:
[ code ]print("hello world");[ /code ]

Code:

print("hello world"); 

Add code with full syntax-coloring:
In Processing, go to the menubar > Tools > Copy for Discourse. Paste into your post, which results in...

Quote:


Add a link:
[ url=http://www.processing.com ]Processing[ /url ]
Processing

[ url ]http://www.processing.com[ /url ]
http://www.processing.com


Text formatting:
[ b ]bold[ /b ] - Text bill be bold
[ i ]italic[ /i ] - Text will be italic
[ s ]strikethrough[ /s ] - Text will be strikethrough


Post an image:
[ img ]http://processing.org/img/processing_beta_cover.gif[ /img ]






(Admins, if you think this list is useful go ahead and reuse it to your liking. Maybe make a sticky out of it, so people can link to it. Oh, and if you know a way around the "extra-space-in-the-[]-hack", let me know.)