How do you change your voicemail message when you dont answer the phone?

you know how when some does not answer the phone it goes straight to their voicemail message? well how do you chnage it? because my new one is: hi this is [my name] and i cant pick up the phone right noe because %26quot;i just dony know who you are%26quot; thats from closer from ne-yo hahahahahah any other song ideas?How do you change your voicemail message when you dont answer the phone?when you call voicemail it'll tell you numbers to press for different options and one of them is personal options. there it'll say change message or whatever it says and you can record whatever you want.