We have just sent an email to the address listed with instructions for creating a standard account on Bricks by Milk.
Please also write a private message to make sure that the person you want to add to the team received the email correctly.
To connect the new user to your team you will need to add them by repeating the search process.
Once you have found the email you will simply click on "Add" to link the user to your team.
In case the user has not yet created their account you will have the option to resend the invitation.