Login into your account at eDispatches.com
Click Messaging on the top left of the screen
Select the "Everyone" group or any custom mage groups you've made.
To send a voice message, Click the Voice Tab on the right side and then the Generate button for a call-in code. You can then use that call-in code to send a voice message to the group of recipients you have selected.
Please follow the on-screen instructions with your generated code to send a priority blast voice message to the group of recipients you have selected.