Shoutbox

Go to Tools > Options

Firstly, clear the nickname box. Now, where you change your name, is a button saying 'Format Codes', click that, then click the 'T'ext button. Click 'Gradient text'. Now, click on two colours you want (dark red and light red)

It should look something like this:

[c=1][/c=2]

Now put your name inside the format codes, like so:

[c=1]MY NAME[/c=2]

Note: numbers 1 and 2 are only used as an example, this will be different depending on the colours you chose.