1. You will see an letter icon on Wii menu, click that. Now click the pen and paper button. Before you can email you need to open the address book and add the person you want to e-mail and go through the register process. When you are done, the other e-mail address will get a confirmation e-mail. Once its confirmed, email can be sent.
basicall its all easy to figure out once you get to the point I described.