One method of adding a track point to your plan is tapping the ‘+’ at the top right hand side of the flight plan. This opens the ‘Add Track Point’ window, and automatically shows the keyboard.
If you wish to just dismiss this window, you must hide the keyboard first by tapping the ‘hide keyboard’ button on the bottom right hand side of the iPad keyboard. Then you will see a ‘Dismiss’ button on the bottom of that window. Tap that and the view will disappear.