The email in your profile reflects the one in your ticket. To be able to change it, you will need to change the email associated with the ticket first.
You can log in to your ticket dashboard here. Once logged in, navigate to the ticket you want to change and click "Transfer." You will then be able to enter the email you wish to have it in your profile.
Please note:
1. By reassigning the ticket, even to another address you own, you will lose all progress in the mobile app including connections, requests, chats and saved schedule items. These cannot be recovered.
2. Although you can see your email address on your profile in the app, this will only be visible to your accepted connections.