In order to create a repeat buy schedule, you must first have a fiat (e.g. USD, EUR, GPB, etc.) balance on the exchange. ZenDCA cannot purchase crypto currencies on your behalf, with your debit card or ACH account on the exchange itself.
All of the exchanges make depositing fiat simple and the funds are usually available right away to start trading. You will have to wait a few days for the deposit to clear with the bank, before being able to send cryptos.
Once you connect with an exchange, there will be links to add funds on the "Connected Exchanges" page. We also have helpful notifications throughout the application in case you don't have enough funds to make a purchase.