The are times when users need to insert a custom code particular to the Registration page of a NetSuite Standard Web Site and within the <body> tag. Here is a sample step on how you can insert a code snippet particular to the Registration page.
Navigate to Commerce > Site Builder > Customize Text
Click on Customize in the Text Group being used in your web store
Click on the Headings tab
Under Default Text column look for New Customer Registration
In the Customization column type in New Customer Registration
Add the following sample script:
// insert your custom code after this line