How do i set up the voicemail / visual voice mail?

I just bought my new blackberry bold 9700 on at&t today. and I was wondering how to get the voice mail set up?

i hold down one and then it calls it says we need more info to direct your call to appropriate voice mail box. to leave a message, please dial the 10 digit number of the number you are trying to call. or something like that... and idk what that means? can you help me! thanks i'm so confused!!


Help me thanks! if you could can you tell me how to do it step by step? thanks.