To apply leave, go to sidebar menu and click on the Apply Leave link then click on Add button present at top right corner in the leave list page, at click of this button Add Leave modal will be open.
Here select Apply Date, Class, From Date, To Date, Reason, Attach Document and then click on Save button. You can view this added record in the Leave List page.

add leave image

Once leave is added, you can see it in the Leave List page.

Leave list image

To edit apply leave, click on Edit icon and to delete apply leave, click on Delete icon present in the Action column.

Note - Before apply for leave make sure you have assigned leave to staff from Human Resource > Staff Directory > Edit Staff at Leaves section otherwsie on Leave Type drop down no record will be shown.