http://civilwartalk.com/forums/misc.php?do=bbcode#basic
if you click on "user cp" then go to edit signature you will see a link called vb that will give you more info...
but here is some stuff to get ya started
Bold / Italic / Underline
The {b}, {i} and {u} tags allow you to create text that is bold, italic and underlined.
Usage
{b}value{/b}
{i}value{/i}
{u}value{/u}
Example Usage
{b}this text is bold{/b}
{i}this text is italic{/i}
{u}this text is underlined{/u}
replace { } with [ ]
Example Output
this text is bold this text is italic this text is underlined
Color
The {color} tag allows you to change the color of your text.
Usage
{color=Option}value{/color}
Example Usage
{color=blue}this text is blue{/color}
Example Output
replace { } with [ ]
this text is blue