Please note - changing a staff email does require you to remove the users access. This means it should be done by another member of staff as to not potentially lose access to your account.
To change a staff email address:
Click into the user
Go to 'Edit Details'
Under 'File Information' click 'Remove User'
Click 'Save'
From there, click 'Edit Details' once again
Click 'Create User'
Change the email, enter a password, and add the access rights back if needed
Click 'Save' again