How to upload and attach files, pictures, etc to message posts using the most basic settings here...
http://www.youtube.com/watch?v=0eLy_AS71pw
The video below is the "advanced" process for uploading attached files using the enhanced controls.
http://www.youtube.com/watch?v=CuPJRIapLU4
How do I put a little picture (Avatar) of me in my messages?
How do I put a little message at the bottom (signature line) of my messages with links in them?
http://www.youtube.com/watch?v=52xBFuC_5fY
The forum has 3 ways to view threads. Linear, Threaded and Hybrid.
Most should use Linear and it is the forum default. Still, some might like to view a thread using the old 'newsgroup' style.
Basically Linear shows all the message posted in time stamp order.
Threaded and Hybrid show a thread...
There are several colors available you can select to view the forum. Go to the lower left of the page and select the pull down menu (green arrow) and pick a color (red arrow). Try them all and see which one you prefer..