You might create a new member if you want your teammates to have different roles and permissions.
Instructions
Log In and click on a Settings Icon
Go to Members Tab and click on Create button
3. Select a Role from drop down menu or start typing in the search bar to quickly find a Role. Fill the form and click on the Save button. New user is created and the notification is sent to him/her.
E-mail field is unique. You can’t have more than 1 user using the same e-mail address. Choose the right role for the member. You can find member roles description here.