Updating primary email
In order to update the email address to your Hightail account, just click on the avatar at the top right of the screen while logged into your account.
You will see an "Edit" button next to your current email address.
Click the "Edit" button.
Enter your new email address along with your current password to your Hightail account.
You will receive a confirmation email at the new email inbox.
Click the confirmation and follow the prompts and you will have successfully updated your email address.