ADDING DOORBOX SECURITY CODE TO USPS
STEP 1 - Open USPS Website
STEP 2 - Click On Register/Sign In
STEP 3 - Click On Sign Up Now
STEP 4 - Fill Your Personal Details
STEP 5 - Fill Your Address And Click Verify Address
STEP 6 - After Verifying Your Address Your Account Will Be Activated.
STEP 7 - Click on Your Name and Click On My Profile
STEP 8 - Click on Address Book
STEP 9 - Click On Add Address
STEP 10 - You Can Add Your DoorBox Code Here. Click On Save Address