The best way is to explore our command set.
When you add a new instruction, click on the 'Select' button, this is the screen that will open;
Select either MMP or Scratch Pad.
Click on a command you like the sound of, then click on the command help at the bottom.
You will quickly find a way to move your desired variables to where you can read (and write) them.
Now you just set up a chart that does the moving once a second or so.