In this tutorial we will guide you through the installation and setup of the United States Postal Service module, which allows you to generate a shipping price based on the USPS rates.

This module requires you to have an account setup with the United States Postal Service Website.

Installing the USPS Module:

1. Login to the Admin panel for osCommerce.
2. Click the Modules menu button, then select Shipping.
3. Select the +Install Module button. You will see a list of available shipping modules.
4. Click the United States Postal Service option, then select the +Install Module button to the right.

Set Up the USPS Module:

1. The United States Postal Service Module will now be listed, select it and click the Edit button to the right.
   
   You will now be able to modify the USPS shipping module settings:
   

   Option	Description
   Enable USPS Shipping	True enables, this shipping option. If you select False, this shipping option will not be available. It will still be installed, just 'turned off.'
   Enter the USPS User ID	Enter your user ID for your USPS account.
   Enter the USPS Password	Enter the password for your USPS account.
   Handling Fee	Enter a handling fee if you are charging one, this will only be charged once, no matter how many items are ordered.
   Tax Class	You can choose a tax class if you want to charge taxes on the shipping price.
   Shipping Zone	You can select a shipping zone from this drop-down menu, if you do, this setting will only apply to that zone.
   Sort Order	The number you enter here will affect where this option will display on the modules list. Zero will be at the top of the list, and higher numbers will be further down the list.

   After making your selections, click the Save button to record your modifications.
   
   Congratulations, now you know how to install and configure the USPS module in osCommerce!