Here's how to change it on each platform.
Web
Go to Settings → My Info
Under Username, tap Change Username
Enter your new email address
Enter your current password to confirm
Tap Save
Mobile
Tap menu icon (top left) → My Info
Under Security, tap the refresh icon next to Username
Enter your new email address
Enter your current password to confirm
Tap Change
If you need any further help, don't hesitate to contact our support via in-app/on-site chat.
