Changing My Email Problem

My old email was a Gmail account. I switched everything to a Proton Mail account. When I went into my IPad setting to change my email I only saw one place to put in a new email so I put in my new email and Apple took it. However, somehow it is still under a GMAIL heading and the email under my name at the very top is still my Gmail account even though Apple did change my email. But now it will not let me send outgoing emails. I see no way of getting rid of being under that Gmail heading. I think it is thinking that new email is just another Gmail account. Does anyone have any ideas? I was going to try and delete the new Proton Mail account and see if I could redo it but I have no other email account to add and verify. It's a mess! And I am an 80 year old granny with no tech skills. HELP!