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In the project Dashboard Collaborators panel, you can invite multiple members via their email address to your project to perform the annotations along with you.
You will be the Administrator. In order to invite your team mates, you need to send an invite to the concerned teammate by entering the email address and then clicking on the Send Invite button as shown below.
On clicking the send invite button, an Invite will be sent on the mentioned email address and the status will be pending until your teammate accepts the invitation.