Style Help

[Mum]

I have a default style set http://www.mummybrain.com/index.php?styleid=18

however, i've just installed a new style http://www.mummybrain.com/index.php?styleid=21 - it is all uploaded correctly, and i've installed the xml - but i can't see the new style. I've selected that you can change style, but can't work out what else can be wrong. Could someone help please.

[Princeton]

I can see the 2 different styles.
one is blue/white; the other is green/tan

[Mum]

Yeah thank you, i managed to sort it by reading an article on help on another site :)