Cannot changing login button color, have tried theme, plugins… is it GoDaddy managed?

The login page doesn’t load your theme’s stylesheet.

If you want to include extra CSS on your login page then you should hook login_enqueue_scripts and write out an extra <style> tag there, or include another CSS file (or even your theme’s full CSS file if you want to).

You could also use login_head, and there’s an example of including another CSS file in the login_head documentation, but it sounds like login_enqueue_scripts is more correct.