With open timesheets you see the timesheets that have not yet been submitted. In the table you can see how many hours have already been logged and how many of them are billable. When hours have been logged, you can submit the timesheet. When you do this via the table, you are automatically designated as an approver. Via the 3 dots menu you can click through to the timesheet, to view additional details or to add or edit time entries. When you submit via the timesheet, you can possibly select a different approver.