To access Voicemail dial 5001 If it is your first time accessing your voicemail box, your default pin is 1530. This can be changed by dialing option 5 within the voicemail menu, than option 1 once the initial setup has completed.
Once you have logged in your mailbox, you will then be asked to record your name followed by the #. After recording your name, you will be asked to record your greeting. Follow prompts to accept your greeting or re-record if you are not satisfied with your initial recording.
Below is a voicemail tree detailing the various options available (click picture to enlarge):