EDIT: For all wondering the same as he and I were, the following is the proper procedure:

1. Log into IRS e-Services on irs.gov and view/access your original EFIN application 

2. Select the applicable firm of yours you're wanting to update location for or select "Individual"

3. Select "Add New Location" from the dropdown menu

4. Enter your information in the application

That's it.

Since/if you already have EFIN you are automatically "grandfathered in" and will receive a new EFIN immediately, which you willl see on the Application Summary screen.

Happy Tax Season folks.

Louis S. Marchman