Yes, it is important for you to add employees in the system to explore various functionalities. This will also help you to understand how the product works and how it can be used effectively for your organization.
To carry out different functionalities, you need to create employee profiles. For instance, if you want to check out how an employee can apply for leave - then you need to have an employee who will raise a leave request in the system and a manager who would approve it.
P.S. Feel free to add dummy employee data to try out the application. You can later exit them from the system. For any any queries, you can Request Support by clicking the icon given in the application.