Thanks for considering a donation.
There are two options to pay through PayPal. The first option is you can pay through your PayPal account. In this case, you should have your PayPal account, and you just need to put your PayPal’s email address and password.
Another option is paying through your credit card directly (without having PayPal account), this option is for whom don’t have a PayPal account.
If you don’t have a PayPal account, then you can go with the second option.