Hello @Adra9oN龙,
The answer provided by is no longer the correct way to contact support, his answer is from 2015.
To change your email address please contact Epic Account Support by filling out this form. It says Fortnite, but it’s for UE4 support too, just select “PC/Mac” from the Fortnite Game Platform combo-box, select a random Game Mode, and then use “Accounts” option for Game Issue.
Make sure to include all relevant information, they will reply back to you by email. Please note the support staff are very busy so it may take a few days to receive a response.
Thanks