To track hours per day (as opposed to per visit/jobs), all you need to do is as follows :
From your My day tab, click on Today and then on Clock in.
When you are ready to pause, click on Break now then Restart now after your break and Clock out at the end of the day.
Then click on Submit to automatically register the hours into the timesheet.
The daily totals will be reflected in the Timesheets grid under the Tools menu.
Other related articles include :
Tracking the time an employee spends on a visit/job (single employee).
Tracking and editing hours worked (multiple employees at the same job).