New "WYSIWYG" editor mode
I've enabled the WYSIWYG (what you see is what you get) option for the board's editors. This means that in the box where you type up a post, there is a button in the upper right corner with an "A/A" sort of symbol.
You can click it to switch between viewing your post with the formatting commands you've typed in like bold, italics, and so on, and viewing what it will actually look like. Try it and see.
On some browsers this "auto switch" symbol may not appear. You can still select the WYSIWYG editor. Go to your User CP, then pick "Edit Options", and look near the bottom for "Message Editor Interface".