Here's a little video (3:30) I just put together about how to make a basic forum post. I'll add some more shorter ones to demonstrate more advanced techniques.
I'm still working to get the integrated flash player working right, so please hang with me. Unfortunate Community Server doesn't support it intrinsically, so I might have to build it as an add-on.
For the time being, you have to click on the .swf file attached below to view it. I've had good results in Firefox and poor results in Internet Explorer on Windows.
The file is also rather large (8MB), so be patient.
I'll update it as soon as I can.
Please post any questions in the comments.