Your Prepay plan gets deducted daily for each account connected, so you must have a sufficient balance to continue copying. To recharge, expand the cart icon located at the top navigation bar --> select Recharge Prepay eWallet. From here, you'll be taken to the pricing page where you can choose the amount you'd like to reload.
Access the direct link to the Prepay Plan page and select the amount to deposit, then click Deposit.