Go to
AdminCP ->
Skin & Templates ->
Select a Skin -> by the skin you like click on
Import and you should be done.
You can see all the skins available here:
http://www.forumer.com/screenshots.php
Many people have reported that this function doesn't work at the moment though so it is possible that it won't work for you either, but try it.
In the case that you also get an error message you will have to wait until it's sorted.
You can't use a vbulletin skin in IPB forums...... it's a different software.
Hope it helped. Good luck
