Within the Start Screen, you can either

 

 

Open the last Project

On the right screen, the last used project is displayed. Just click on the project name to open the project.

 

Select a Project

Click on Open existing Project. A windows file dialog will appear. You can open all files with the extension .MME. Open Flash-Demo.MME to work with this tutorial.

It is not possible to open the same project twice at the same time.