Steps to follow to add user accounts in the Office 365 admin center.

After this step, your users will have Office 365 licenses, logon credentials, and Office 365 mailboxes. 

1. Go to the Office 365 admin center
2. On the Home page, choose Add a user. 

3. Fill in the information for the user. Choose Add when you are done.
    

      User Information

1. Name    Fill in first, last, display name, and user name.
2. Domain    For example, if the user's username is Jakob, and his domain is example.com, he'll sign in to Office 365 by typing [email protected]
3. Contact information    Expand to fill in a mobile phone number, address, and so on.
4. Password    Use the auto-generated password or expand to specify a strong password for the user.
5. They'll need to change their password after 90 days. Or you can choose to Make this user change their password when they first sign in.
6. After you add a user, you'll get an email notification from the Microsoft Online Services Team