Using MultiCalendar Personal/Professional/Enterprise Edition - Appointment - Creating an Appointment

After you have open MultiCalendar, the second step for you may to create one or more appointments in it.  

Method 1: Double click the cell on the dayview grid to bring up the appointment editor. Input the data you want then press "Save and Close" button to save it.  
 
Method 2: Use mouse to select more than one cells and release mouse's left button, right click and the pop up menu will appear. Choose new event to create a new event.  
 
Method 3: Use mouse to select more than one cells and release mouse's left button, start to type to directly insert a new event.