How to Route Between "A" and "B" when I'm at "C"?

I have recently decided to give MapFactor Navigator a try. I am running the free version on a tablet under the Android O/S. The version of MapFactor Navigator is 2.2.78. 

It seems to work adequately if I give a destination and route there. However, if I select an origin and a destination it does not give me a route between those two points. I have tried both clicking to selection origin/destination and using the search function. Neither works. It simply selects a route from my current location to the destination.

Can anyone tell me what I am doing wrong and how to select a route between two points, neither of which is my current location?

Thanks in advance for your assistance.

regards

Stephen Meatheringham

Canberra, Australia