You'd think it was simple enough... but I seem to be stuck on this.
On my site I use a shopping cart for the front end and a forum for customer support. Recently, another upgrade came out that interfaces with a business page on FB.. All this really does is provide FB Followers access to the shopping cart on/via FB.. the issue is, on my FB business page the area only shows the shopping carts company logo and I want to change that to my companies Logo. I've checked everything on my server image wise to try to find it but I cant find out where that image is being called from,,
Any help pointing me in the place I need to go ??

heres the link to the business page so you can see the issue for yourself;

If you see the "shop" its clear what I'm trying to change out..