If you would like to delete your employee data you can either partially delete it or you can delete all data.
You can delete some of the employee data by removing a specific field, an answer or data you have added to the system.
Deleting an answer
You can also delete an employee answer. To do so you:
Find the employee
Go to answers
Find the answer you would like to delete and press "delete"
You can also remove data tied to the employee object. Say you would like to remove their last name. You can simply click on last name. Remove it and save.
You can delete all data associated with the employee by going to the employee and clicking in the top right corner and choosing "Delete employee".
You can read more about it here.