Here are the steps I took to change my email address in LastPass.
- In the upper right corner, click your account name and select Account Settings
- Change your Account Email and click Update
- LastPass will send an email to the updated email address. Open that email, copy the code, paste it in the Code field, and click Confirm
- LastPass will prompt you for your Master Password. Enter it and click Confirm
- LastPass will re-encrypt your data
- Then log you off
- Log in using your new email address
- Your account will now reflect your new email address