Please help with Dragon dictation app.

Hi to all, please does anyone know how to use Dragon dictation app? I have a few questions regarding using this app: 1. Once you have the message recorded how do you check it out before sending as a text, a mail or FB/twitter status? 2. Is it possible to rerecord the message before posting? I have tried to rerecord the message but it has been recorded right after the previous message, so the previous message has not been deleted. I hope it makes sense. If there is anyone who would be willing to help me with using the app, please write here or at: maria.orovcikova@gmail.com Thank you very much for your help, it would be very highly appreciated.