You can change the email address associated with your account by going to:
Settings > Account > Email and following the prompts.
Only one email address can be associated with a Sense account.
Similarly, only one account can be associated with an email address. If you wish to create more than one Sense account using the same email address, we recommend you use 'plus addressing' to create a subaddress. The syntax is basically to (1) use the first part of your email address (all that precedes the @ symbol), and (2) add a plus mark (3) follow with new info as you wish. Don't add any spaces.
It looks like this:
email@example.com modified to
All email from both addresses will be delivered to firstname.lastname@example.org
The data from these seemingly separate accounts cannot be automatically merged.