Don't worry, everyone have hit that wall before. Did you created a summary field in your table?. Are you using it in your layout?.
Filemaker uses the summary field to do the counting for you. So create a summary field and let's call it Task_count of type summary. In the options of that field select "Count of" and select the field "Task", close the field definition screen and enter layout mode and go to your report.
After the body of the report, make sure you have a part of type sub-summary when sorted by: and select last-name (Hoping no two persons have the same last name if they do use the Emp-id better). Put the Task_count summary field inside the sub-summary part in a way that the field should not touch any of the borders of (Upper and lower) part. Enter browse mode, select all the records and sort them by last name (or Emp-id if you used it) and enter preview mode. You should now have your rough report. I let you do the shinning.