MITEL 5224-how do you set up your voicemail??

I have this phone at work. There's a button that looks like an envelope. Touch that and it will prompt you through recording your voice mail. This phone also features various "away" messages so that you can record a couple different ones and then activate whichever you want depending on your day. This is also accessed through the voicemail button. Once you play around with it a little, you'll find it's a rather simple phone. Right now, I'm trying to figure out how to access my voicemail from home! Good luck!