Start collaborating with your team by adding teammates to your workspace. You can add them from Settings & members, in the section Members > Invite members.
When you create a group, it is by default a private group (only visible to you). To share a private group with other members of your workspace, simply click on "Share".
As soon as someone gets access to a shared group, they will have full permissions within the group. It means that they can add, delete and edit contacts.