Using Yahoo email in Mac OS mail app

I have created my Yahoo account in my Mac OS mail, but I can't seem to bring it online-attempts to change it from offline to online are futile.

Anyone with a Mac able to help? I tried Yahoo chat, the AI bot is useless and if I want help from Yahoo I have to pay.

I can't stand Yahoo in the browser. I can't see the text very well b/c my eyes are old now. The ads are annoying and I will drop Cox before I pay for Yahoo premium.