Why it is showing error that 'firebase not defined in line no'?

Question

I want to make an Instagram login page which get the user data.But it is showing error.Can you please correct it.
https://code.sololearn.com/Wp7B14Ks0J67/?ref=app

Answer 1

https://www.sololearn.com/Discuss/356193/?ref=app

https://www.sololearn.com/Discuss/1742020/?ref=app

Answer 2

Forgive me if I am missing something, but I do not see anywhere in your code where firebase is defined or imported. How would the program know what firebase is supposed to be?

Answer 3

How i import firebase in this