To change your email address:
Sign in to your Short.io account.
Navigate to Settings -> Profile -> User Information:
Click on
next your email address.
When prompted, enter your new email address and click on Verify:
A verification email is sent to this new email address. Open it and click on Confirm email:
The Short.io page is automatically reloaded and from the Settings -> Profile -> User Information panel you can review the saved changes: