Choose either: 
  Site>Manage Site> and select the site and click Done or 
  select Window>Files if you have already defined your site and it was previously selected.
double click an html file to work on from the list.
*note: 
  To make a new folder in the site, select: control + Click on Mac and Right click on PC. Then select New Folder from the context menu. 
  
  *note: To move around files, just select and drag them.
   
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