When defining a string variable, the entire variable will need to have double-quotes around it (i.e. var myStr = "Bob"). The difficulty in this challenge is understanding how to put double-quotes inside a variable that is defined using double-quotes. That is where the escape character (the backslash) comes in handy.
Try looking at the var sampleStr in the challenge description again, and follow that example to help you out. Best of luck!