Steps
1) Create a text file and insert the text you want to add to the one-page checkout form.
2) [Note: The file name includes the area where the text will be included.] Save the file with one of the following names:
addon_content_loginform.wws
addon_content_billingform.wws
addon_content_shippingform.wws
addon_content_orderitems.wws
addon_content_paymentform.wws
addon_content_shippingmethodform.wws
3) You can include HTML tags, but be careful with images. The one-page checkout is a 'secure' document; therefore, the images must be referenced with this tag: <%= __imagelink%>
This tag will render the exact secure URL for your images. Therefore, your HTML code for an image would be something like this:
<img src="<%= __imagelink%>images/filename.jpg">
[Note: “filename.jpg” must already be in your secure image folder.]
