Step 1: Click the "Browse" button right beside "Input File" label to select the file you want to create ringtone in the window that pops up, then click "OK" button. You will see the file path and name are displayed in the "Input File" textbox.
Step 2: Click "Play" button to hear the music before creating ringtone and find the part you want to use. Then drag and drop the start & end slider to get music clip to convert, or type the start & end time in the corresponding text box directly.