The Content tab (or palette) is where your files should be, but it depends on how you have it set to display (by default it uses the Caetories view, which shows only items that have been added to the database - you can switch to one of the two folder views, which show the way things are in your actual content folders, with the option menu - triangle button at the extreme top-right of the palette) and on having your content fodlers selected correctly (you may have only the default Poser content folder - you need to have the Content folder in the folder you installed to selected as a DAZ Studio content directory in Edit>Preferences>Directories too).