By default, all the access records cannot be changed and deleted. However, you can add an access record for an employee should he forgot to Clock-In or Clock-Out. This feature is usually required only for the payroll purpose.
A manually added record is shown differently in the access report as shown below:
The records in pink color with the checkbox next to them indicate that these records were added manually. You can later on delete these records by selecting the checkbox and then press the Delete button at the bottom of the page.