There are two basic places where you can save the BlocklyProp projects you create: on your computer, and on your Propeller board's EEPROM memory. Let's look at the latter first.
When you used the green arrow to run your project, you were loading into RAM. You may have seen the flyover text when you clicked the button (left), or you may have noticed the Load Into RAM popup before the Terminal (right)
RAM, or Random Access Memory, is volatile, meaning it does not retain data if power is interrupted. If you run a project in RAM and then turn your board off and on again, the project will not run again because it is erased from the Propeller microcontroller's RAM.
The Propeller Activity Board WX, Propeller FLiP, and similar development boards have an EEPROM chip connected to the Propeller microcontroller. EEPROM, or Electrically Erasable Read Only Memory, is non-volatile. When you load a project into EEPROM, it stays there even if the power is cycled, until you write over it with new data. Let's try it.
Notice the message now says Load into EEPROM briefly before the terminal opens.
Each time you press the button, the message will reprint in the Terminal.
It is good practice to save your BlocklyProp projects to your computer frequently while you work. In fact, a message will pop up every 20 minutes to remind you. Once you load a project to your Propeller board EEPROM, you cannot get the project out and back into BlocklyProp.