Please help me solve the exercise

Hello guys,sorry for my bad english,i cant solve t,please help me
I can’t finis it
var myStr; // Change this line

myStr = ‘FirstLine\n\b\n\tSecondLine\b\nThirdLine’

Read the instructions carefully:
This is what the challenge wants:


This is what you have.
See, the differences between two and try solving.
Hope that helps.