When you setup OpenCart store by default it will show the default logo on your store which is something you surely need to change. Here we will see how you could change store logo.
Login to OpenCart Admin Panel using Admin credential
Navigate to System>Settings and click on “Edit” link for store.
Open “Image” tab from all settings and click on default image. It will give you edit option using which you could change it.
Select image you want to keep as store image. You can choose from already uploaded image and if it is not available you could upload from your local machine.
Save settings and check your store home screen. You should be able to see new image on your store home screen.