How Do I Change My Voicemail Greeting for My Sony Ericsson phone?

I have a sony ericsson s500i. And I was just wondering how to change the voicemail greetings. I did it the first time but then I messed up on something so I want to do it again. I'm always having problems with this stupid phone. Can someone please help me?How Do I Change My Voicemail Greeting for My Sony Ericsson phone?There is a way to fix it. I had a Sony Erricson phone too. There is a section in your phone you can go to called Quick Hints or Tips or something close to that. If you go to that, sorry I'm not sure how to find it. I don't remember, I recently got the LG Shine. It will tell you what to do.