When you start Fast Text to MP3 first window is dialog box of wizard. You should select source text. Currently Fast Text to MP3 meanwhile supports a clipboard and text files. If you have chosen file you must select file name. To select file name press "Browse" button. If you selected clipboard you should copy text to clipboard from any application. use keyboard shortcuts Control+A (select all) and Control+C (Copy). These commands work in all programs practically. For example you can copy to clipboard interesting web page. Or you can edit MS-Word document and copy document into the clipboard. After you selected the text press "Next" button.