Select Home > Messages.
Locate the contact group and click on the
icon.Click Delete, and select OK when the "Are you sure you want to delete the [Name] contact group?" pop-up displays.
Click Delete again.
Select Home > Messages.
Locate the contact group and click on the 
icon.
Click Delete, and select OK when the "Are you sure you want to delete the [Name] contact group?" pop-up displays.
Click Delete again.