How can I add an account admin to our avatax account?

Overview

I have custom user roles in Netsuite and need to be able to give specific Avatax permissions to those roles.

Netsuite

To show the Avatax Menu for different roles in Netsuite:
Go to Setup→ Customization→ Center Tabs
Within this menu you will want to edit both the Classic Centre and Accounting Centre AVATAX lines.
Within the Center Tab Edit screen there is an Audience sub-tab.
This is where customers control who can and cannot see the Avatax Centre tab within Netsuite.
You can assign specific roles or simply check the “Select All” check box next to “roles.”