Just type letters, numbers and punctuation into the top box and press the "Translate" button. The program tidies up what you entered (removing any illegal characters) and places the Morse code in the bottom box. If you want to hear the Morse code, press the "Play" button (you must have a sound card for this to work). You can choose the speed of the playback from the pull-down menu.
You can type Morse code into the top box using '.' for a dot and '-' or '_' for a dash. Letters are separated by spaces and words by '/' or '|'. When you hit the "Translate" or "Play" button the program will tidy up your input and translate it into plain text. If it cannot translate a letter it will place a '*' in the output.