Hi! Thanks for your questions.
No there's no administrator since it is a free account, I believe in this case i am the administrator... And, yes, i changed mi phone a few months after i registered the account. One curious detail is that I was able to change my password without problem, it sent a code to my email address, and offered me to do so for two addresses I registered, so I don't understand what's the problem with the login part.
Greetings!