The red status line at the bottom of the screen shows the "mode", ie, what happens when you click on the map.
Use these arrows to adjust the displayed area of the map, without zooming.
Zoom to different map "levels". The current level is shown in the "Reference" section on the right of the screen
Quickly zoom to a specific location.
Use this section to control which overlays and text are displayed on the map.
To order a map, click the "Select" button in the Order section, then click on the map to order the map at that position. Each click adds one map to your shopping chart. Then click Checkout. All the maps you ordered are zipped into a single file for easy downloading.
Click on the red question marks for more detailed help on each section.