Calendar

The purpose of the Calendar is to show you when your payments are due. To get a payment to show up on the calendar you have to set the "Due By" value for the creditor you want to show the payment for. If you have already created the creditor then you will need to edit it and set a value for the "Due By" field. If you are creating a new creditor then you would also set a value for the "Due By" field.
Your calendar at a glance
While the calendar will allow you to drag and drop an item from one location to another, the creditor needs to be updated for the change to really take affect. Not assigning a value to "Due By" will prevent the creditor from displaying on the calendar as a payment.