Click settings 
> Members to invite new team members:
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Collaborators are available with Business and Enterprise plans. See pricing plans for more details.
Note
Our free subscription plan allows you to send up to 200 pending invitations every 7 days. If you have already reached that limit and try to invite additional folks to join you, we'll display an error message for you. Don't worry though! You can send more the next week, or whenever some of the currently pending ones have been accepted.
An organization can have multiple administrators. When you create an organization, you will automatically be an administrator on this organization. If you want to downgrade to collaborator, or leave this organization, the organization has to have at least one other administrator.
Note
You will always be the administrator of your default organization, and you can’t leave or delete this organization.