To make a new Reservation, press the New Reservation button (shown below)
This will open a new screen were you need to select the dates of the reservation. Select from the calendar's provided - check-in date, check-out date - it will then search for available rooms within those dates and list them on the right hand side for you to choose from. Once you have selected the room, simply press the Create Reservation button.
It will then bring up the Reservation screen, fill in the details and press Reserve.