Add additional users to Microsoft 365 Business
Add new users
Go to the admin center at https://admin.microsoft.com.
In the left nav choose Users > Active users.
On the Active users page, choose Add a user.
In the New user panel, type in the required information.
You can also enter additional information under Contact information, choose how you set the password under Password setting, and assign roles under the Roles.
In the Product licenses section, set Microsoft 365 Business product license setting to On.
See also Add users individually or in bulk.