How it works, page-18

At the bottom of that page, it states you need to pay off with your statement.

At the time of purchase, you will only be charged for the first payment. The remaining balance will be held on your credit card until the final payment is made. After each monthly payment, the amount held from your available balance will be reduced to the new remaining balance (the held amount might appear as pending.)To be eligible, you must own a VISA or Mastercard and have the entire amount of your purchase available on your card.

Your 0% interest will apply as long as you pay in full your card statement balance.