Cannot change secondary e-mail into primary, continuation

Hi, After submitting my first question, I got a prompt that the confirmation e-mail is sent to my primary e-mail. The problem is that I cannot open my primary e-mail because of outdated security protocol of the server. I can contact the server owner, but it might take awhile and it doesn't mean that I could open my primary e-mail after that. Also, if a confirmation e-mail looks like "Approve sign-in to Mozilla" one, containing the authorization code, the problem is that I don't see where to enter the code and I don't see instructions. Thanks.