In order to ship boxes with carriers that require an electronic transmission (either EDI or XML based) you must setup each account code for each customer.
To do so follow these instructions:
Click on the "Setup" tab.
Search for the customer for which you wish to setup the days of service.
Click on the "Edit" link under the "Actions" column for the customer that you will be updating.
Click on the "Days of Service" tab. You will see a list of the days of the week as well as a list of carriers below the Days of Service sub-title.
Search for the carrier for which you are going to setup the Account #.
Enter the Account #.
Click on the "Save" button. Repeat this process for any other carriers that require an account.
For Multiple Locations: The account number can be setup for each carrier based on location. The steps are the same way as described above for single location, the only difference is that the list of locations associated to the customer will appear on the left side of the screen. Repeat the same process for each location for other carriers that require an account. The screen will appear as seen below: