Due to security reasons, it's not possible to change the email address for an Albert account.
One way to get around this is to create a new account with the new email address and change the invoice numbering to the last one on your old account. In this way you continue your administration.
Here is an article on changing invoice numbers for the new account:
If you would like to save the files and an overview report from your previous account, then there is a super easy way to do that.