Once route is proposed by application around given point, it's possible to see vaypoints and things you are about to see on the rout, but how could this route be modified by adding other waypoints or deleting some unwanted sections of proposed route?

Application suggests interesting routes based on given criterias and length but I couldn't find a way to edit this sugested route, even after saving it with my name and notes etc. What skill am I missing as a new user?
Cheers!