How do I register and integrate my site with USPS?
On the Admin, visit Site Info > Carriers
From here or within the USPS tab (highlighted in red), click the Register for User ID link, which will take you to the registration form on the USPS website.
After registering, they will give you their contact information, and you can email or call USPS to activate your account and user ID (mention WebJaguar E-Commerce Solution and your user ID).
When complete, click on Update, which is located on the bottom left of the page.