Get rid of all the myVar and myNum stuff. That is just example code demonstrating how variables are assigned values from other variables. You don’t want to copy/paste that into your solution. I recommend you click the “Reset All Code” button to give yourself a fresh start.
Now look at the example code to see what it is doing. Do you understand what is going on there? After the last line, what would the value of myNum be? If you understand this then the solution to this exercise is pretty easy. How would you put the value of a in to variable b?