Step 1: Sign in to Office 365 in your admin panel.
Step 2: Go to the Office 365 admin center.
Step 3: On the Home page, choose Add a user.
Step 4: In the Name  field,  Fill in first, last, display name, and user name.
Step 5: Domain:  For example, if the user's username is Jakob, and his domain is oryon.com, he'll sign in to Office 365 by typing jakob@oryon.com.
Step 6: Contact information:    Expand to fill in a mobile phone number, address, and so on.
Step 7: Password:   Use the auto-generated password or expand to specify a strong password for the user.
Step 8: After you add a user, everyone you'll get an email notification from the Microsoft Online Services Team. The email will contain the person's Office 365 user ID and password so they can sign in to Office 365.