Logo Not Appearing in Header

Hi.

I can’t seem to get my logo to appear on my header. I have tried uploading jpg vs. png and also tried different sizes, but nothing seems to work. There is no site title on the header whatsoever. Is there a setting that causes the logo and site title to not show up on the header? I have looked at other threads but nothing seems to work. I don’t know much about coding either. =/

My site url is: wwww.greenhouse-movement.org

Thanks!
Ryn