Saving the circuit program
Click on the save icon in the standard toolbar to save the circuit program.
The circuit program is saved under the name it was opened with, while older versions are overwritten. When you initially save it, you are prompted to specify a program path and name.
Opening a circuit program
You can always clicking on the File open icon to open a circuit program for further editing. You open a list of recently opened programs by clicking on the arrow icon on the right side of the button.