First, the files need to be in a folder SA recognizes. They should probably be in a "Draw" file in "DeLorme Docs).
To show them on the map, click on "Map Files" probably on the left. Then on the right side is "Add." Click on "Add" and then "Draw Files." It should show the an1 files. It will add the file you select and there will be a check box so you can turn it on and off