As a line manager, you can approve time for your staff on the My Work, Approvals tab. A weekly summary of timesheets by resource and approval status is provided here:

You can:

    select the weeks you want to approve and click Approve, Unapprove or Disapprove

    click on the hours in the Approved, Unapproved or Disapproved column to drill into the detailed entries and approve them

    change the data shown using the filter drop-down list.