Go to Settings>Voicemail settings then select Voicemail number. Once there you should see the voicemail number as *86. Now just add a pause by putting a p after the *86. You may have to add 2 pauses. After adding the p you can now add your password right after it. For instance, mine looks like this: *86ppXXXX where XXXX is my password.
I'm having trouble with my youmail app, voicemail don't show up for an hour no matter what my poll settings are, and I'm not receiving texts alerts when I have a voicemail...don't know if it's the phone or because I ported my number over from AT&T....I'm getting the run around from Verizon saying that they don't support 3rd party apps, and I'm getting the run around from Youmail support saying that I have to get with the carrier...go figure...I uninstalled Youmail and now I'm waiting on an invite for Google Voice.