Never post any personal information because an adware robot could find it, and start sending you all kinds of spam. This includes e-mail, phone, and home information.

Please remove that information from your post.

Okay, what/where do you want to make this change? In a forum like this one?

Go to your user profile for that website and change the e-mail.

However, if you are talking about sync;

Resetting the sync password, or changing its e-mail, will remove all data from the servers.

This is a security feature. https://support.mozilla.org/en-US/kb/ive-lost-my-firefox-sync-account-information

• I've lost my Firefox Sync account information - What to do
• I’ve forgotten, or don't have access to, my Firefox Account email address