All the users in your teams need to be added as members so they can collaborate on projects and other entities.
Adding members to an organization
You can add someone to your organization by their email-id or username. Click on the add members button to invite new members.
The default role is member. An org admin can update the role from member to org admin and vice versa. An org admin cannot update his/her own role.
Managing org admins
There can be multiple org admins in an org. The org creator is org admin by default. One org admin can invite or remove another org admin. There should be at least one org admin in an org. To make someone an org admin, go to org member list view and change their role from member to org admin.