How do I change the speed of a previously sailed leg of a voyage?

In order to change the speed of a previously sailed port or legs of a voyage you must rollback the voyage to the desired leg. To do so you must do the following:

• Start from the most recent port > delete port activities > delete activity report (Includes bunkers received if present)

• Perform the above until reaching the desired leg of the voyage

• Change the speed of the leg