@Dennis-Dawson once you have started navigation you can't move waypoints. That has to be done in the planner. You can however skip a waypoint. Assuming you are displaying the next wapoint (top right corner),you can easily skip to the next waypoint by tapping on the waypoint and then answering yes to the confirmation message, or long press on the next waypoint to quickly skip it.
To display waypoints, use the (...) menu and select Waypoints. Once you have the list of waypoints you can skip to another waypoint by pressing on the waypoint.
Honestly, this is all basic operation if you simply took the time to watch some of the training videos and perhaps even reviewed the manual.