The "Schedule" section in the Voyage drawer shows a timeline of port calls on a voyage. You can create, rearrange, delete and edit port calls directly from this screen.
When hovering the mouse over a port call in the schedule, a toolbar in the upper right will appear.
To insert a port call before or after the port call you are editing, click the Create Newbutton and select Before or After. A window to create a new port call then opens.
To edit a port call, click the Editbutton.
To delete a port call, click the Deletebutton.
To change the order of port calls, click and drag the Movebutton to move the port call into place.
In the voyage drawer at the schedule section you will find a checkbox for locking the update of voyage start date and ballast port. This checkbox is not visible while the voyage has status Estimate or Unallocated.