Click on the 'Show Selected' button and wait a moment.
Click on the 'Show Data' button and wait a moment.
Click on a green link.
Pick a dataset to map and, after picking from lists if necessary, click on the 'map-it' link.
Move the cursor over a mapped point and see the data from that point in the box.
If applicable, you may click on the 'graph it' or 'get it' links. Or if those links do not
appear, you can view the data by clicking the 'online' link.
There are more kinds of mapping available, but this will get you started.