Help:Skins
From NSDLWiki
Clicking on the my preferences link in the upper right while logged in then click on the Skin button to change your skin. You can also preview the skin by click the (preview) links next to each skin.
Clicking on the my preferences link in the upper right while logged in then click on the Skin button to change your skin. You can also preview the skin by click the (preview) links next to each skin.