Go to Settings -> Collaborators to add collaborators to your dataset.
Permissions
Collaborators can have one of 4 roles: labeler, reviewer, manager and administrator. Each role has a different set of permissions:
Labeler
Reviewer
Manager
Administrator
Label samples
Review samples
Delete and resolve issues
Add, update, delete collaborators
Edit sample priority and assigned labeler/reviewer
Add and delete samples
View, add, delete releases
Manage settings
Labelers and reviewers can only see the "Overview" tab of a dataset, where they can click the "Start labeling" and "Start reviewing" buttons depending on their role. Note that they cannot browse the samples on the Samples tab.
Managers and administrators can add collaborators to a dataset. Note that a manager cannot add a collaborator with an administrator role.