I dont know where is my mistake

Tell us what’s happening:
i watched video and still dont understand
Your code so far

var myStr= 'FirtsLine

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36.

Challenge: Escape Sequences in Strings

Link to the challenge:

you can’t create a linebreak inside a string going to a new line, you need to use the special character \n