Yes, you can change your payment method from PayPal to a credit card (Stripe). However, you will need to contact our billing department at billing@memberpress.com.
They will cancel your current subscription and give you a coupon that will let you sign up again so that you can change your payment method. Unfortunately, there is no way to switch between Stripe and PayPal without canceling your current subscription.
As an alternative, you can also add your credit card to your PayPal account and change your payment method for your MemberPress subscription.