From your World Account dashboard, select 'My account' in the top-right corner of your portal display.
From the drop down menu, select 'My team'.
Select 'Invite new user' on the right-hand side of the portal display.
Enter the name of the user.
Enter the user's email address.
Select one or more roles for the user (or 'select all' in the bottom right of the drop down).
Agree to the terms and select 'Send invitation'.
Confirm via Twilio Authy or SMS.
All done! Your invite has been sent.
Note: The invite link is only active for 7 days and emails may got to the recipients junk mail/spam.