In order to view your list of current and historical opportunities, click the Opportunities tab at the top of the screen. You will then be presented with your list of All, Active, Won, On Hold, Lost, and Deleted (Trash) opportunities.
In order to manage an opportunity, simply click the opportunity name on the left sidebar. Then, on the top right of the page, you’ll see a status that shows what stage the opportunity is in (ie: Active). To change the stage of the opportunity, click on the Active button and select what is most applicable.