Help?? voicemail on phone

i got a tracfone just to make my stepmom stop telling me i was irresponsible and the only way to prove i was responsible was to work my way from a tracfone to a cellphone. so i got a tracfone. I'm having trouble setting up the voicemail b/c im so confused with it. i clicked voicemail and it says edit number. but idk what to do there? help. pls