Arkman, if you are talking about putting a marker on a spot (looks like a blue push pin), tap the screen and you should see what looks like crosshairs appear with a question mark in blue on the right. Tap the question mark and it will take you to another screen where you will see "marker" on the upper right. Touch "marker" and then at the bottom touch "add". You will have that place marked.
Hope that helps a little.

