You must confirm your email address in order for it to be fully associated with your Twitter account.
Note: You’ll receive two emails when you choose a new email address on your account – a memo will go to your old email address, and a confirmation link will go to your new email address.
Step 1: Enter your email on the Settings page
Step 2: Enter your password to save the change.
Step 3: We'll show the message below you until you've confirmed the new email.
For more details on how email confirmation works, or to troubleshoot issues confirming your email address, please check out this article: Trouble Confirming Your Email Address