1- Start by login to the TokBox account.
2- In the top right corner, select "My Account" and then click on "Profile & Billing"
3- Click on the pencil icon in the top right corner of the "Contact Info" section
4- Enter your new email address and press "Update"
5- An email will be sent to the new email address. Search for the subject "Confirmation Instructions"
6- Click on "Confirm new email"
From now on, use the new email address to access your TokBox account. The previous account will not work any more.