How can I reset my voicemail? Because I can no longer receive them after using youmail.
Exactly as lemew said - your Verizon voicemail is still intact.
http://support.youmail.com/entries/384215-cancel-youmail-go-back-to-carrier-voicemail-deactivate-call-forwarding
To literally reset it you will need to contact tech support.
Customer service can reset your voicemail password.
Cancel your call forwarding to the youmail number.