Hiero doesn't support logo, how to add it manually?

Friends, as you know “Hiero” theme doesn’t contain a logo space in it’s header, can you please check it and tell me exactly how to add a logo? I have been working on that for 2 days, but nothing works, I removed the theme, reinstalled it and started from beginning, nothing happened.

My logo path: /wp-content/themes/hiero/logo.png

CODES:
Stylesheet.css

[ Code redacted ]

I would appreciate any help.