The SharePoint Web Designer Galleries group is not shown in the Site Settings for the default team site. In this demo in the SharePoint Online from Scratch series Peter Kalmström, explains how to allow custom script to display the Web Designer Galleries. Also refer to http://kalmstrom.com/Tips/SharePoint-Online-Course/Allow-Custom-Script-In-SharePoint.htm
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The #Office365 from Scratch series has now gone into #SharePoint Online: http://blog.kalmstrom.com/2015/06/display-sharepoint-online-web-designer.html