Please tell me where to upload my replacement image on Charm for the Community Picture

I am trying to replace the big picture of the couple that is on the charm template on the login page. I did it before on my test site and now I am not finding where that setting was to upload it. If you go to my site at https://www.drcarney.com/community you will see the big picture I am wanting to replace. On my test site I replaced it already and I am sorry to ask again. But, where is the location to upload the image to replace it?

Thanks, Sean