Click on Rankings along the top menu in the dashboard. The page will default to Average Rankings on the left with Local selected for Ranking Type. The graph to the right is the history of your keywords. On the left, you can adjust the time frame to see a certain period of time.
The difference between Local and Web is:
Local: Local Maps pages like Google, Bing, Yahoo, Apple Etc
Web: Organic search results on Google, Bing & Yahoo. If you navigate to one of these search engines and search for "pizza near me" this will return organic search results for you.
You can run the report to show you average rankings or page 1 rankings.