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Click "Next." Select "Start a Full Automatic Scan" and then select "Finish." You will be prompted to save your scan. Once the scan is saved, it will start automatically. If the scan does not start automatically, find the green button with a triangle in it that says "Scan." Click it and then select "Start Full Scan."
Additional Features
For additional control of your scan, click "Scan Configuration." From there, navigate to the "Explore Options" tab. Not all of these options are necessary for all scans. 
Depth Limits: For very large applications, you can change the depth limits so that AppScan will stop crawling after the tenth link.