1. Dial 1600
2. When you hear the auto attendant, press "*"
3. When you hear "Thank you for calling", press "#"
4. You will be prompted to enter your mailbox number, enter your extension 
5. You will be prompted to enter your security code, enter "0000"
6. You will hear the auto attendant say.."As a new user...."
7. Listen and follow the instructions given to you by the Auto Attendant
   

 You will be given an opportunity to change your security code and to record your main greeting and name.