Click Open or Open Recent in the toolbar, and the chosen files/folders will be shown in the "file list".
Select a file in the "file list", and the data elements will be shown at the panel to the right.
If a change is made, the file will be marked with a 
Use the checkbox 
to select many files to edit at the same time, such as when adding a album cover to a set of files.
Below the album cover are 5 icons
Use an image file on the Mac. It is also possible to drag an image file to the album cover area
Remove the album cover
Copy the album cover to the clipboard
Use the camera to take a picture and use it as album cover. If an iPhone is connected to the Mac computer, use menu - camera to select the camera source
