Okay, I'm gonna rip
Yue's post about this topic and streamline it.
Quote:
Here is a screenshot of the "post" area:


If you want to do fancy stuff to your text, you use the buttons underneath the Subject line. In the message box, just highlight what you want bolded, italicized, or whatever and press the corresponding button. It will place the tags in front and behind the text that you just highlighted. Your text should look look something like this:
Code:
[b]bold[/b]
[i]italic[/i]
[u]underline[/u]
If you want to check if you did it correctly, hit the Preview button like so:

If everything looks good, go ahead and post it!
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For posting up pictures you have to have a image host... register with either
Imageshack
Photobucket
This is to show your pictures ups but uploading it to the image host and then use the image host to direct the link or link the picture up and then use the IMG tag to show your picture In other words, you can either highlight what you want bolded, italicized, underlined, and so on and hit the button above or you can manually type in the BB Code (i.e. those thing in between the square brackets) yourself.
Here are the other BBCodes that Yue didn't list:
Code:
[quote]Will quote whoever you want to quote in inside a box.[/quote]
[quote="Name of Person Here"]Will quote a what a person said and mention's WHO said it. Just put the person's name in the quotation marks at the front there.[/quote]
[code]This tag is used if you want to type in some kind of programming code that you do not want messed up (i.e. misaligned) when it is posted in a forum.[/code]
[list]Makes a list of things in bulleted form[/list]
[img]Type in the address to the image in this area here[/img]
[url=http://url address to where ever goes here]description of where the link goes to written here[/url]
[spoiler]Hides information. To view the information, people have to hit the button to see it.[/spoiler]
If you would like to link an image with a URL, you have to nest it like so:
Code:
[url=http://url to place][img]url to image here[/img][/url]