Unfortunately the email address cannot be changed because there is no reasonable way for us to confirm the email address manually. If you want to change the email, the only way is to remove the existing user and then invite a new one (with the desired email address). During the trial period, you can invite just as many users as you want. Later on, we will implement a feature that allows the change of your email address. If you want to change the email address after the trial period has ended, we suggest you ask another user from your account to remove your user and then invite a you with the new email address. This way you don't have to pay for additional user.
No data will be removed if you need to remove a user. So, you don't have to be afraid that you couldn't access the data in case you need to add a new user and remove the old user account.