You can add additional team members to your account and give various permissions by clicking on the 'Company Users' tab in your dashboard.
Click on + New User to add a new company user and tick the options depending on the level of permissions you wish to grant that person access to.
Admins - can do everything a Company user could do before, as well as toggle the admin status of other users in their Company.
Non-admins - Are unable to edit, delete, publish or unpublish the sales opportunity. They also can not edit the company profile or perform any invoice or contract related actions.