How do you format tags?

Every tag, no matter colour or formatting, has a dollar sign in front of them, all the tags applies to the text to the right of the dollar sign.
Formatting tags has 8 different functions:

$i: italic
$s: shadowed
$w: wide
$n: narrow
$m: normal
$g: default color
$z: reset all
$t: Changes the text to capitals
$$: Writes a dollarsign

Examples:

Input: $iTrackmania$$---output: Trackmania$
Input: $wname---------output:n a m e

MORE INFO
On the official TM forums, there is more info about the various codes, as well as in-depth explanation of how the colour codes work:
TM-Forum
Trackmania FAQ