You can easily change your account email by logging in to your Hostinger account.
Once logged in, click on the profile icon and choose the Account Information option:
Once there, scroll down to the Account settings section. Click on an arrow near Email:
Enter your new email address and click on Continue. Next, confirm by entering your password.
Once the change is applied, you will be requested to verify this change via email or your two-factor authentication method if you have enabled it 😊
How to Change the Registered Email if You Have Enabled Social Login
If you get a "We are unable to change the email address message" message, it means your
account has social login enabled. In that case, click on Unlink social login, and you will be redirected to unlink your account from social login.
After unlinking, you will be able to change your account's registered email.
Additional Resources
If what you need is to change a domain's contact information (eg. to move a domain), follow this guide instead: How to Change Your Domain Contact Details