If you want to Link your debit card to your PayPal account you might be adding unnecessary steps or stress. Because, PayPal want to link to your bank anyway, and that's the same account that your debit card pulls from. As as result, you don't need to add your debit card. In fact, most PayPal transactions are cheaper if you link your bank account directly.
But if you if you insist to add your debit card, you need to add it to your profile. To do so, log into your profile, or your account and click on your wallet. Next; find the section to link a card or bank. Meanwhile if you can also add card while a payment is going on.select "New Card" and choose how you want to be paid. SoSo to link; select the type of card you're using and provide card detail. Make sure the card us not expired.