New users can be invited from the "Users & Groups" page.
You may add an unlimited number of users and groups to your account.
To add a user to your account, simply enter their email address and they will receive an invitation to create a profile.
If your account is using SAML, they will receive an invitation to login via the SAML login page, so please ensure that invited users have access to the SAML application via your organization's upstream SAML settings.