You will see your all number list here. You will need to edit any number to register E911.
1. First go to "Numbers->Your Numbers" to see your all numbers.
2. Click on edit.
3. Now fill the form for emergency 911 configuration.
4. After complete the form, click on "Provision 911" button.
5. Now, you will see a confirmation popup. Click "Ok" to continue. That's all.