Hi @Jessicalauer081 and welcome,
I am sorry to hear that you are having such issues accepting a payment. When you are accepting the payment and trying to log in are you using the same email address that the payment was received to? This would be the email address that you received the notification of the payment and that you need to accept it. If this is not the email account that is registered to your PayPal account you will get an error and be asked to log in again.
I hope this helps,
Paula
