I have a free account for my business, but am unable to add more than one email address to my account. How do I add more emails to my account?

I have a free account for my business, but am unable to add more than one email address to my account. How do I add more emails to my account?

You can create and use email aliases to add more than one email address to your account. Read about how to setup email aliases here. 
If you want to create a new email address and use it as a separate account for another user in your organization, you can add a new user and setup an email account for that user. Read more about how to add a new user here.