You can easily change the email related to your account from the Profile section in your Profile page.
Transfer account to another Sympli Handoff user
If you want to exchange account ownership with another Sympli Handoff user, please follow these steps:
First, change the email address of the other user's account [firstname.lastname@example.org] to a different one than the one you want to transfer ownership to [email@example.com]. (There can only be one Sympli Handoff account per email address.)