Can't enter app password in Mail app on Mac

Hi, I have trouble getting in my Mail application on my Mac some time now. I am on 10.13.6

I found the answer here to generate app password in google and the to enter it in Mail accounts settings but I can get to that point. I got the app password but can't find where to put it.

this is what it should look like

and I get only to this

And this is when I try to sign in

Any help? Thank you all