[xubuntu] installing themes in 12.04?

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http://ubuntuforums.org – I am trying to install some new themes in xubuntu 12.04 and I cannot seem to make them work. I went into my home/username folder and created a .themes folder and extracted them all there . but they do not show up in the appearance tab in the settings manager. so after some digging i found the standard themes in usr/share/themes. But I cannot move my themes folders into the usr/share/thems folder. is there a way to get root access to move them? do i have to do this in a terminal window? and if so how?. thanks (Hardware)