Step 1: Go to the TMS URL: 

Step 2: Choose the correct account

Step 3: Click on the TMS User menu item.

Step 4: Click on the Manager sub-menu item.

Step 5: Click on “Create Extension”.

Step 6: Select an extension type.

Step 7: Give the extension a number - This should follow the previously created number. 

Step 8: Click” Add Extension” to save the extension. 

Step 9: On a prepaid account, Pay for the extension to activate it. 

9.1:  Click on the Billing & Accounts menu item.

9.2: Click on the Orders sub-menu item.

9.3: Pay the Pro Rata invoice.