Two things.
1) To add it to that page (since it does not use the standard tpl_main_page.php file) you would need to add it to that page along (manually).
2) I would NOT put the shipping estimate into a pop-up anyhow. It hurts conversion as mentioned in my 20 Ways book and at this link:
Shipping Estimate in a Pop-Up? Why it Hurts Your Conversion, and What You Can do to Fix it.



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