This first set of instructions shows how to open File Manager from our original desktop SiteBuilder. The second set of instructions below is for opening File Manager using SiteBuilder Plus (the web based version).
If you are using the desktop version of SiteBuilder, you will click a link on the left side of the window like shown below.
If the File Manager link is not showing in this location, then you may have closed the Sidebar. To reopen the Sidebar click View > SiteBuilder Bar > Show SiteBuilder Bar, and it will be restored.