Click on Phone Numbers > E911 Numbers
Click on the Green box with the plus sign to add a new E911 number.
Select the number you wish to assign E911 to from the drop-down menu.
Select Add new from the drop-down menu and start typing your address. If it does not find your address, click on Enter address manually
Once you have an address entered, type in an address description and click on the blue box that says Add Address
E911 SMS Number:
Type in the SMS Number you want to receive a notification of when someone calls 911.
Click on "Next"
Select the Trunk you want E911 associated with (optional).
Confirm/choose payment method