To approve a timesheet, navigate to the Timesheets module (Internal > Timesheets). You will see a list of submitted timesheets.
(Note: The list of timesheets you see is dependent on your privileges in the system. A typical user can only see their own; someone with approval privileges can see their own and those of anyone they are set as the “Approver” for; someone with Timesheet Management privileges will be immediately presented with their own and those of anyone they are set as the “Approver” for, but can see everyone’s timesheets via the search function.)
Select the timesheet you want to approve. Click Actions and then Approve Timesheet.