How to save a project for editing next time

To save your movie project, go to File > Save. In the dialog that opens, input the project name and specify where to save the project files, then click Save to finish. 

To edit the movie you've stopped last time, go to File > Open and select the project file from the folder you've saved the project to, or simply open it from the Open Recent menu. 

To change the output path of an existing project, you can use the File > Save As menu.