How to add new users on Atlas?

You can only invite members to join Atlas through an open Board or Project, and only group owners can invite new members.

Go to the Boards page and choose in which one you want to invite someone
Click the green "+" next to the "Members" field
Select the "Add User" button
Enter the new user's email
Then press the "Add" button
To finish the invitation, click "Next" and then "Confirm"

Important: The new invited member will only be able to register after the approval of the system administrator. In case who invited is an owner and administrator, will not need the approval.