At the billing address and shipping address steps of the checkout process in Magento the label for zip/postcode to change Post code. If you want to change, you have to make a few code modifications.
You need to go to public_html/app/design/frontend/base/default/template/checkout/onepage/billing.phtml. This path is to the billing.phtml file of the default theme that comes prepackaged with Magento; if you use another theme you may need to edit the file of that theme. In the billing.phtml file find and comment out the following code (around line 105):
<div class="field"> <label for="billing:postcode" class="required"><em>*</em> <?php echo $this->__('Zip/Postal Code') ?></label> <div class="input-box"> <input type="text" title="<?php echo $this->__('Zip/Postal Code') ?>" name="billing[postcode]" id="billing:postcode" value="<?php echo $this->escapeHtml($this->getAddress()->getPostcode()) ?>" class="input-text validate-zip-international <?php echo $this-> helper('customer/address')->getAttributeValidationClass('postcode') ?>" /> </div> </div>
After that edit the file
public_html/app/design/frontend/base/default/template/checkout/onepage/
shipping.phtml
and comment out the code (around line 96):
<div class="field"> <label for="shipping:postcode" class="required"><em>*</em> <?php echo $this->__('Zip/Postal Code') ?></label> <div class="input-box"> <input type="text" title="<?php echo $this->__('Zip/Postal Code') ?>" name="shipping[postcode]" id="shipping:postcode" value="<?php echo $this->escapeHtml($this->getAddress()->getPostcode()) ?>" class="input-text validate-zip-international <?php echo $this->helper('customer/address')-> getAttributeValidationClass('postcode') ? >" onchange="shipping.setSameAsBilling(false);" /> </div> </div>
You need to edit another billing.phtml file but in a different location.
With public_html being the root Magento directory on your hosting account and
with the default theme, the path to the file will be
public_html/app/design/frontend/base/default/template/persistent/checkout/
onepage/billing.phtml.
In that file find and comment out the code (around line 106):
<div class="field"> <label for="billing:postcode" class="required"><em>*</em> <?php echo $this->__('Zip/Postal Code') ?></label> <div class="input-box"> <input type="text" title="<?php echo $this->__('Zip/Postal Code') ?>" name="billing[postcode]" id="billing:postcode" value="<?php echo $this->escapeHtml ($this->getAddress()->getPostcode()) ?>" class="input-text validate-zip-international <?php echo $this->helper('customer/address')-> getAttributeValidationClass('postcode') ?>" /> </div> </div>