You need to move these files into a single folder. After clicking the “<= AnyCount” button, choose a folder in which these files are located. Hold Ctrl on your keyboard and select the files one-by-one, or select the appropriate files using the Shift button (hold Shift on your keyboard and click the first file from a list and then the last appropriate one), or press Ctrl+A to select all files in the folder. Then click "open" and AnyCount will count all selected files automatically, according to the settings in User Settings > AnyCount.