One of the options on the main menu should be "Mark Waypoint":
If it isn't on the first page, you'll have to scroll to the right to find it. When you're at a spot you want to mark, just hit this button, and then "Save". If you want to change its name or symbol, you could hit "Save and edit", then make the necessary changes.
Thanks its a start my next question is . Is it possible save it as a route or sort of a little map of line of trapping?