Click the PSCAD tab in the ribbon control bar, hover the mouse pointer over Save and select Save Project.
You can also save the project by pressing Ctrl + s on your keyboard, by right-clicking on the project title within the workspace window, and selecting Save from the pop-up menu, or by right-clicking on the Projects branch in the workspace and selecting Save All Projects....
Click the PSCAD tab in the ribbon control bar, hover the mouse pointer over Save and select Save Project As.
You can also save the project by right-clicking on the project title within the workspace window, and select Save As from the pop-up menu.
In either case, the Save Project As dialog window will open with a default Save as type as Project File (*.pscx) or Project File (*.pslx) for case or library project respectively. Change the file name of the project in the File name field. Click the Save button to save the project under a different file name. The project name should then change in the workspace window, indicating that the project was indeed renamed. Note that the project namespace is synchronized with the filename at this point if saving a case project.