To make a holiday request you will need to press "More" at the bottom right hand side of the page, then click "Holiday Requests".
In the top right hand corner, click on "New", select the relevant dates, then enter the amount of paid days off in the "Paid Days" box.
Below you can also add a reason for your request.
Back on the "Holiday Request" page you can click the little circle next to "Show past requests" to view the history request log:
If a holiday request has been rejected by your employer you can click on it to view any notes/ reasons they have left.