Click on your profile avatar then click "Plan". And make sure you are at the "Plan" tab.
In this tab, you can add members to the company, delete members from the company. set the role for each member, and set customized permissions for each role.
note: when a member is deleted from company, they will be downgraded into "free user".
Click "Customized permissions", you will have the access to edit the control for each role.