This is the Start screen. You either need to create a new project or select an existing project.
To create a new project, enter the project name in the "New Project Name" field and click on "begin".
If you have an existing project please click on the "Browse" button to find and select your project.
Also you can open recent project that you were working on via selecting 'Open recent project' drop down list and click on 'Open' button.