You may change your username by logging in to BrightTALK then going to https://www.brighttalk.com/mybrighttalk/profile. From there you will be able to select "edit profile" and change your email address(username). Please note this will change two things:

1. The email address used to login to BrightTALK.

2. The email address where BrightTALK emails and further communications are sent.

If you have any questions feel free to email support@brighttalk.com for further assistance.