Won’t log in when testing checkout

Hi–

I have uploaded the free version of the paypal events plugin to our website so I can test it and make sure it fits our needs. As far as I know, I have followed every step necessary to set up an event and test an order (created a business paypal account and developer account, as well as, a sandbox account). I am currently having trouble when it comes to logging into a personal paypal account to test the “test checkout.” Maybe there is something I did wrong or missed? Did anyone else have this issue?

Please advise.