You will need to upload the image you want to have as your banner by going to nameofyoursite/new/banner
To customize the look of your banners, go to Admin Menu → Site Menu and Layout
Find Main Logo and click Choose...
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Search for the name of the image you uploaded
Select Choose for that image
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If you have a banner you want on the right hand site of the site, on the same Site Layout page
Next to Banner click Change....
Search for the name of the image you uploaded
Select Choose for that image