You’ve done too much here. I would restart the lesson to get the original JS back. The only thing you want to do is change the three lines below the comment. Do not add any new lines of JS. And you definitely do not want to redeclare the variables again.
Look at the instructions again. They are telling you that
myVar = myVar + 5;
is the same thing as
myVar += 5;
So you just want to convert each of the three lines from the first format to the second.