From now on you can pay your trip with MOIA by using your PayPal account.
Simply make sure you're using the most recent app version and add your PayPal account in "Payment" section or directly in the payment process. As soon as you've added your PayPal account you can use it for paying your trip with MOIA.
Giving tip to your driver is unfortunately not yet possible with PayPal. We are working on that and until we have implemented PayPal for driver tipping as well you can either use your credit card after having chosen the percentage you want to tip or simply give your tip in cash.
If you want to know more about PayPal just visit PayPal's official website here.