If it isn't already running, start the virtual instrument by clicking the run button.
At first freely explore the instrument, you can't hurt a virtual instrument.
Assistance is built into each instrument. Open the help window and move your cursor around the screen. Each front panel control and indicator's description will appear in the help window.
The bulk of the documentation is available by placing your cursor over the icon in the top right corner. Every VI has a print button, which sends a picture of the front panel and optionally the long description to your browser.