If anyone else comes across this page I found that the links have changed names/locations. BUT I found this info on paypal developers page that has the new info:
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Activating PDT
To use PDT, you must activate PDT and Auto Return in your PayPal account profile. You must also acquire a PDT identity token, which is used in all PDT communication you send to PayPal.
Follow these steps to configure your account for PDT:
* Log in to your PayPal account.
* Click the Profile subtab.
* Click Website Payment Preferences in the Seller Preferences column.
* Under Auto Return for Website Payments, click the On radio button.
* For the Return URL, enter the URL on your site that will receive the transaction ID posted by PayPal after a customer payment.
* Under Payment Data Transfer, click the On radio button.
* Click Save.
* Click Website Payment Preferences in the Seller Preferences column.
* Scroll down to the Payment Data Transfer section of the page to view your PDT identity token.
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I will also add the link to the paypal info encase it changes again in the future and this link still has the most up to date info:
https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/paymentdatatransfer/