Your email address will be set to the email address you used when your user account was created.
If you need to transfer ownership of an account to a new user then you should invite them into your account and then transfer ownership to them.
To update your email address you must be logged into FastBound
Click the Profile Icon in the top right corner
Choose the Email tab
Enter your new email address
click the 'Save' button
FastBound will send a verification email to the new email address.
Open the email
Click the 'Verify my Email' link in the email you received