To be be strictly accurate, you are working the baseline Zen Cart pages and demo data. As a result adding a category and a product just swells the data without telling us anything about why your Zen Cart isn't functioning as expected.
With the caveat that this is not the best approach for suppressing items on the product_info page (see another branch of this thread for the preferred approach), I am attaching a version of the file you are trying to edit-
tpl_product_info_display.zip. Put this in the correct place on your server and it will, under all circumstances, replace the review and tell a friend buttons with messages in red text.
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