Sygic GPS Navigation by default uses your current position as the starting point when calculating a route. To change the starting point, the steps are the same as when Selecting a destination, but instead of selecting a point as the destination of your route, you simply pull up the bottom sheet with the “Get directions” button. This opens up the location detail options, where you select “Set as starting point” (3 in the screenshot below).
After you have a starting point defined, continue to pick the destination, which is explained in the Selecting a destination chapter.
The starting point can also be changed on the route selection screen after you have selected a destination. Simply tap on the current position field and enter a different address.