As a team owner or editor you can invite your team members to join your Pluto organization. From the Teams tab, add an Organization Member:

Enter their email and select their role. You can add one or multiple new organization members at a time.

Organization roles
Editor
An Editor can edit all Projects and Experiments in this Organization. They can also create new Projects and Experiments.
Member
A Member can add their own Projects and Experiments in this Organization’s lab space. They can also view or edit Projects and Experiments that they’ve been invited to.
Viewer
A Viewer can see all Projects and Experiments in this Organization’s lab space but cannot edit or create new Projects and Experiments.