I got a new iPhone and am trying to make an in app purchase but i forgot some details?

It's an in app purchase and I set some details for two questions about 4 years ago that Apple can ask me to clarify who it is but I have forgotten one of the answers
The questions are where did you grow up and what was your first pet called but my pet was a fish and I have forgotten the name and I don't know how to change the question
I was going to email Apple but can't find an email address

Right now what would be useful is either an email address or how to change the question that I have been asked

Definitely and defiantly are not interchangeable