Only team administrators can invite users to their Balloon team.
In the team drop-down menu in the upper right-hand corner, click on 'users'.
Click on the 'invite team members' button.
On the next screen, you can add email addresses and (optionally) names to invite one or more users to your team.
When you click on the 'invite members' button on the lower right-hand side, each person will receive an email invitation with a unique confirmation link to join your team.
You can learn more the new Flight Creator registration process here.
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