If you have many staff members you may want to take advantage of Groups (Permission Groups) instead of assigning permissions per staff.
You can assign groups via the member's detail page. Or add members from the group's detail page.
Create a Group
Go to Menu > Teams.
Type a name in the input field.
Press the Create button.
Set the permissions you want.
Under the Members tab, you can search for your teammates and add them to the group.
Warning: The "Members" section will not be enabled unless there is at least one permission set on the newly created group.
You can learn more about permissions here.