The employees can add a Leave request, by clicking 'Request leave' button from the top right side of the Dashboard.
Later, to request the leave, all you need to do is to select the leave type from the 'Leave request type' field. And put-in the start/end dates before you hit the Save button at the right bottom of the page.
In the screenshot below you may observe that the employee is seeing his approved leave request as well as the leave requests made by his colleagues. Also the employee can see his colleagues who are already off from the right side of the page under 'Who is off now'. There, the employees can also see the 'National holidays' from under the 'Upcoming Holidays' header.
Note: The employee can not see other employees leave requests and any data under 'Who is off now' until his manager allows him from the account settings.